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Preamble

Pre.1–Pre.7

I N T E R N A T I O N A L C O D E O F B O T A N I C A L N O M E N C L A T U R E

P R E A M B L E

1. Botany requires a precise and simple system of nomenclature used by bota-
nists in all countries, dealing on the one hand with the terms which denote the
ranks of taxonomic groups or units, and on the other hand with the scientific
names which are applied to the individual taxonomic groups of plants. The
purpose of giving a name to a taxonomic group is not to indicate its characters or
history, but to supply a means of referring to it and to indicate its taxonomic
rank. This Code aims at the provision of a stable method of naming taxonomic
groups, avoiding and rejecting the use of names which may cause error or
ambiguity or throw science into confusion. Next in importance is the avoidance
of the useless creation of names. Other considerations, such as absolute gram-
matical correctness, regularity or euphony of names, more or less prevailing
custom, regard for persons, etc., notwithstanding their undeniable importance,
are relatively accessory.

2. ThePrinciples form the basis of the system of botanical nomenclature.

3. The detailedProvisions are divided intoRules, set out in the Articles, and
Recommendations. Examples(Ex.) are added to the rules and recommendations
to illustrate them.

4. The object of theRules is to put the nomenclature of the past into order and to
provide for that of the future; names contrary to a rule cannot be maintained.

5. TheRecommendations deal with subsidiary points, their object being to
bring about greater uniformity and clearness, especially in future nomenclature;
names contrary to a recommendation cannot, on that account, be rejected, but
they are not examples to be followed.

6. The provisions regulating the modification of this Code form its last division.

7. Therules andrecommendations apply to all organisms treated as plants
(including fungibut excluding bacteria), whether fossilornon-fossil*. Nomen-

* Inthis Code,the termfossilisapplied to a taxon when its name is based on a fossil type and the
term non-fossil is applied to a taxon when its name is based on a non-fossil type (see Art.13.3).

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Pre.8–Pre.l0

Preamble

clature of bacteria is governed by the International Code of Nomenclature of
Bacteria. Special provisions are needed for certain groups of plants: The Inter-
national Code of Nomenclature for Cultivated Plants-1980 was adopted by the
International Commission for the Nomenclature of Cultivated Plants; provi-
sions for the names of hybrids appear inAppendix I.

8. The only proper reasons for changing a name are either a more profound
knowledge of the facts resulting from adequate taxonomic study or the necessity
of giving up a nomenclature that is contrary to the rules.

9. In the absence of a relevant rule or where the consequences of rules are
doubtful, established custom is followed.

10. This edition of the Code supersedes all previous editions.

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Principles

I–VI

D I V I S I O N I. P R I N C I P L E S

PrincipleI

Botanical nomenclature is independent of zoological nomenclature.

The Code applies equally to names of taxonomic groups treated as plants
whether or not these groups were originally so treated*.

PrincipleII

The application of names of taxonomic groups is determined by means of
nomenclatural types.

PrincipleIII

The nomenclature of a taxonomic group is based upon priority of publication.

PrincipleIV

Each taxonomic group with a particular circumscription, position, and rank can
bear only one correct name, the earliest that is in accordance with the Rules,
except in specified cases.

PrincipleV

Scientific names of taxonomic groups are treated as Latin regardless of their
derivation.

PrincipleVI

The Rules of nomenclature are retroactive unless expressly limited.

* For the purposes of this Code,plants do not include bacteria.

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1–3

Ranks

D I V I S I O N I I . R U L E S A N D R E C O M M E N D A T I O N S

C H A P T E R I . R A N K S O F T A X A ,

A N D T H E T E R M S D E N O T I N G T H E M

Article1

1.1. Taxonomic groups of any rank will, in this Code, be referred to astaxa
(singular:taxon).

Article2

2.1. Every individual plant is treated as belonging to a number of taxa of
consecutively subordinate ranks, among which the rank of species (species) is
basal.

Article3

3.1. The principal ranks of taxa in ascending sequence are: species (species),
genus (genus), family (familia), order (ordo), class (classis), division (divisio), and
kingdom (regnum). Thus, except for some fossil plants (see 3.2), each species is
assignable to a genus, each genus to a family, etc.

3.2. Because of the fragmentary nature of the specimens on which the species
of some fossil plants are based, the genera to which they are assigned are not
assignable to a family, although they may be referable to a taxon of higher rank.
Such genera are known as form-genera (forma-genera).

Ex. 1. Not form-genera:LepidocarponD. Scott (Lepidocarpaceae),MazocarponM. Benson (Sigilla-
riaceae),Siltaria Traverse (Fagaceae).

Ex. 2. Form-genera:Dadoxylon Endl. (Coniferopsida),Pecopteris (Brongn.) Sternb. (Pteropsida),
Stigmaria Brongn. (Lepidodendrales),Spermatites Miner (seed-bearing plants).

Note 1. For the ranks of hybrid taxa, see Art.H.3.1.

Note 2. Art.59 provides for form-taxa for asexual forms (anamorphs) of certain pleomorphic fungi,
of any rank.

3.3. As in the case ofcertain pleomorphic fungi, the provisions of this Codedo
not prevent thepublication and use of names of form-generaof fossils.

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Ranks

4–5

Article4

4.1. If a greater number of ranks of taxa is required, the terms for these are made
either by adding the prefix sub- to the terms denoting the ranks or by the
introduction of supplementary terms. A plant may be assigned to taxa of the
following subordinate ranks: regnum,subregnum,divisio,subdivisio,classis,
subclassis,ordo,subordo,familia,subfamilia,tribus,subtribus,genus,subgenus,
sectio,subsectio,series,subseries,species,subspecies,varietas,subvarietas,forma,
subforma.

4.2. Further supplementary ranks may be intercalated or added, provided that
confusion or error is not thereby introduced.

Note 1. For hybrids and certain variants of species in cultivation, seeAppendix I and Art.28.

Note 2. In classifying parasites, especially fungi, authors who do not give specific, subspecific or
varietal value to taxa characterized from a physiological standpoint but scarcely or not at all from a
morphological standpoint may distinguish within the species special forms (formae speciales)
characterized by their adaptation to different hosts, but the nomenclature ofspecial forms shall not
be governed by the provisions of this Code.

Article5

5.1. The relative order of the ranks specified in Arts.3 and4 must not be altered.

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6	Definitions

C H A P T E R I I . R A N K S O F T A X A ( G E N E R A L P R O V I S I O N S )

S E C T I O N 1 . D E F I N I T I O N S

Article6

6.1. Effective publication is publication in accordance with Arts.29-31.

6.2. Valid publication of names is publication in accordance with Arts.32-45or
H.9(see also Art.75).

6.3. Alegitimate name is one that is in accordance with the rules.

6.4. Anillegitimate name is one that isdesignated as such in Arts.18.3 or63-67
(see also Art. 21Note 1 and Art. 24Note 1).A name which according to this
Code was illegitimate when published cannot become legitimate later unless it is
conserved.

6.5. Thecorrect name of a taxon with a particular circumscription, position, and
rank is the legitimate name which must be adopted for it under the rules (see Art.
11).

Ex. 1. The generic nameVexillifera Ducke(1922), based on the single speciesV. micranthera, is
legitimate because it is in accordance with the rules. The same is true of the generic nameDussia Krug
& Urban ex Taubert(1892), based on the single speciesD. martinicensis. Both generic names are
correct when the genera are thought to be separate. Harms (Repert. Spec. Nov. Regni Veg. 19: 291.
1924), however, unitedVexillifera Ducke andDussia Krug& Urban ex Taubert in a single genus;
when this treatment is accepted the latter name is the only correct one for the genus with this
particular circumscription. The legitimate nameVexillifera may therefore he correct or incorrect
according to different concepts of the taxa.

6.6. In this Code, unless otherwise indicated, the wordname means a name
that has been validly published, whether it is legitimate or illegitimate (see Art.
12).

6.7. The name of a taxon below the rank of genus, consisting of the name of a
genus combined with one or two epithets, is termed a combination (see Arts.21,
23, and24).

Ex. 2. Combinations:Gentiana lutea, Gentiana tenella var.occidentalis, Equisetum palustre var.
americanum, Equisetum palustre f.fluitans, Mouriri subg.Pericrene, Arytera sect.Mischarytera.

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Typification

6.8. Autonyms are such names as can be established automatically under Arts.
19.4,22.2, and26.2, whether they were formally created or not.

S E C T I O N 2 . T Y P I F I C A T I O N *

Article7

7.1. The application of names of taxa of the rank of family or below is deter-
mined by means ofnomenclatural types (types of names of taxa). The application
of names of taxa in the higher ranks is also determined by types when the names
are ultimately based on generic names (see Art.10.5).

7.2. A nomenclatural type (typus) is that element to which the name of a taxon is
permanently attached, whether as a correct name or as a synonym. The nomen-
clatural type is not necessarily the most typical or representative element of a
taxon.

7.3. Aholotype is the one specimen or other element used by the author or
designated by him as the nomenclatural type. As long as a holotype is extant, it
automatically fixes the application of the name concerned.

7.4. If no holotype was indicated by the author who described a taxon, or when
the holotype has been lost or destroyed, alectotype or aneotype as a substitute
for it may be designated. A lectotype always takes precedence over a neotype. An
isotype, if such exists, must be chosen as the lectotype. If no isotype exists, the
lectotype must be chosen from among thesyntypes, if such exist. If neither an
isotype nor a syntype nor any of the original material is extant, a neotype may be
selected.

7.5. Alectotype is a specimen or other element selected from the original
material to serve as a nomenclatural type when no holotype wasindicated at the
time of publication or as long as it is missing. When two or more specimens have
been designated as types by the author of a specific or infraspecific name (e.g.
male and female, flowering and fruiting, etc.), the lectotype must be chosen from
among them.

7.6. Anisotype is any duplicate (part of a single gathering made by a collector at
one time) of the holotype; it is always a specimen.

7.7. Asyntype is any one of two or more specimens cited by the author when no
holotype was designated, or any one of two or more specimens simultaneously
designated as types.

7.8. Aneotype is a specimen or other element selected to serve as nomenclatural

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7	Typification

type as long as all of the material on which the name of the taxon was based is
missing.

7.9. A new name published as an avowed substitute (nomen novum) for an older
name is typified by the type of the older name (see Art.33.2; but see Art. 33Note
1).

Ex. 1. Myrcia lucida McVaugh(1969) was published as anomen novum forM. laevisO. Berg(1862),
an illegitimate homonym ofM. laevis G. Don (1832). The type ofM. lucida istherefore the type ofM.
laevisO. Berg (non G. Don),namely,Spruce 3502.

7.10. A new name formed from a previously published legitimate name (stat.
nov.,comb. nov.) is, in all circumstances, typified by the type of the basionym (see
Art.55.2).

Ex. 2. Iridaea splendens (Setch. & Gardner) Papenf.,I. cordata var.splendens (Setch. & Gardner)
Abbott, andGigartina cordata var.splendens (Setch. & Gardner) Kim all have the same type as their
basionym,Iridophycus splendens Setch. & Gardner, namely, Gardner 7781 (UC 539565).

7.11. A name which was nomenclaturally superfluous when published (see Art.
63) is automatically typified by the type of the name which ought to have been
adopted under the rules, unless the author of the superfluous name hasdefinitely
indicated adifferent type.

7.12. The type of a name of a taxon assigned to a group with a nomenclatural
starting-point later than 1753 (see Art.13) is to be determined in accordance with
the indication or description and other matter accompanying its valid publica-
tion (see Arts.32-45).

7.13. When valid publication is by reference to a pre-starting-point description,
the latter must be used for purposes of typification as though newly published.

7.14. A change of the listed type of a conserved generic name (see Art.14 and
App. III) can be effected only by a procedure similar to that adopted for the
conservation of generic names.

Ex. 3. Bullock and Killickpublished inTaxon(6: 239. 1957)aproposal that the type ofPlectranthus
LHér. be changed fromP. punctatus (L.f.) LHér. toP. fruticosus LHér. Thisproposal was
approved by the appropriate Committees and by an International Botanical Congress.

7.15. The type of the name of a taxon of fossil plants of the rank of species or
below is the specimen whose figure accompanies or is cited in the valid publica-
tion of the name (see Art.38). If figures of more than one specimen were given or
cited when the name was validly published, one of those specimens must be
chosen as type.

7.16. The typification of names ofform-generaof plant fossils(Art.3.2), of
fungal anamorphs (Art.59), andof any other analogous genera or lower taxa
does not differ from that indicated above.

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Typification

8–9

Note 1. See also Art.59 for details regarding typification of names in certain pleomorphic fungi.

7.17. Typification of names adopted in one of the works specified in Art.13.1(d),
and thereby sanctioned, is based on everything associated with the name in that
work.

7.18. The type of an autonym is the same as that of the name from which it is
derived.

Recommendation7A

7A.1. It is strongly recommended that the material on which the name of a taxon is based, especially
the holotype, be deposited in a permanent, responsible institution and that it be scrupulously
conserved.

Article8

8.1. The author who first designates a lectotype or a neotype must be followed,
but his choice is superseded if the holotype or, in the case of a neotype, any of the
original material is rediscovered; it may also be superseded if it can be shown that
it is in serious conflict with the protologue* and another element is available
which is not in conflict with the protologue, orthat it wasbased on a largely
mechanicalmethod of selection,or that it is contrary to Art.9.2.

Ex. 1. Authors following the American Code of Botanical Nomenclature, Canon 15 (Bull. Torrey
Bot. Club 34: 172. 1907),designated as typethe first binomial species in order eligible under certain
provisions. Thismethod ofselectionis considered to be largely mechanical. Thusthe lectotypifica-
tion ofElymus L. byE. arenarius L. (Nash inBritton & Brown,Ill. Fl. N. U.S. ed. 2, 1: 288.1913), the
first species to be listed by Linnaeus,has been superseded by the choice ofE. sibiricus L. by Hitchcock
& Green (Nomencl. Prop. Brit. Botanists 121. 1929).

Article9

9.1. The type (holotype,lectotype, orneotype) of a name of a species or
infraspecific taxon is a single specimen or other element except in the following
case: for small herbaceous plants and for most non-vascular plants, the type may
consist of more than one individual, which ought to be conserved permanently
on one herbarium sheet or in oneequivalent preparation(e.g., box, packet, jar,
microscope slide).

9.2. If it is later proved that such a type herbarium sheet or preparation contains
parts belonging to more than one taxon, the name must remain attached to that
part (lectotype) which corresponds most nearly with the original description.

Ex. 1. The holotype of the nameRheedia kappleri Eyma,which applies to a polygamous species, is a

* Protologue (fromπρωθος, first,λογος, discourse): everything associated with a name at its valid
publication, i.e., diagnosis, description, illustrations, references, synonymy, geographical data,
citation of specimens, discussion, and comments.

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10	Typification

male specimen collected by Kappler (593a in U). The author designated a hermaphroditic specimen
collected by the Forestry Service of Surinam as a paratype* (B. W. 1618 in U).

Ex. 2. The type of the nameTillandsia bryoides Griseb. ex Baker(1878) is Lorentz 128 in BM; this,
however, proved to be a mixture. L. B. Smith (Proc. Amer. Acad. Arts 70: 192. 1935) acted in
accordance with this rule in designating one part of Lorentzs gathering as the lectotype.

9.3. If it is impossible to preserve a specimen as the type of a name of a species or
infraspecific taxon ofnon-fossil plants, or if such a name is without a type
specimen, the type may be a description or figure.

9.4. One whole specimen used in establishing a taxon of fossil plants is to be
considered the nomenclatural type. If this specimen is cut into pieces (sections of
fossil wood, pieces of coal-ball plants, etc.), all parts originally used in establish-
ing the diagnosis ought to be clearly marked.

9.5. Type specimens of names of taxa must be preserved permanently and
cannot be living plants or cultures.

Recommendation9A

9A.1. Whenever practicable a living culture should be prepared from the holotype material of the
name of a newly described taxon of fungi or algae and deposited in a reputable culture collection.
(Such action does not obviate the requirement for a holotype specimen under Art. 9.5.).

Article10

10.1. The type of a name of a genus or of anysubdivision of a genus** isthe type
of a name of a species(except as provided by Art. 10.3).For purposes of
designation or citation of a type, the species name alone suffices, i.e., it is
considered as the full equivalent of its type.

10.2. If in the protologue of the name of a genus or of any subdivision of a genus
reference to one or more species names is definitely included, the type must be
chosen from among the types of these names. If no reference to a species name is
definitely included, a type must be otherwise chosen. Such a typification is to be
superseded if it can be demonstrated that the selected type is not conspecific with
any of the material associated with the protologue.

10.3. By conservation, the type of the name of a genus can be a specimen used by
the author in the preparation of the protologue, other than the type of a name of
an included species.

10.4. The typeof a name of a family or of anysubdivision of afamily ***is the
same as that of the genericname on which itis based(see Art.18.1).For purposes

* See Guide for the determination of types,T.4(c).

** Here and elsewhere in this Code the phrase subdivision of a genus refers only to taxa between
genus and species in rank.

*** Here and elsewhere in this Code the phrase subdivision of a family refers only to taxa between
family and genus in rank.

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Priority

of designation or citation of a type, the generic name alone suffices.The type of a
name of a familyor subfamily not based on a generic name is thesame as that of
thecorresponding alternative name(Arts.18.5and19.7).

10.5. The principle of typification does not apply to names of taxa above the
rank of family, except for names that are automatically typified by being based
generic names (see Art.16).The type of such a name is the same as that of the
generic name on which it is based.

Note 1. For the typification of some names of subdivisions of genera see Art.22.

Recommendation10A

10A.1. If the element selected under Art. 10.3 is the type of a species name, that name may be cited as
the type of the generic name. If the element selected is not the type of a species name the type element
should be cited and, optionally, a parenthetical reference to its correct name may be given.

S E C T I O N 3 . P R I O R I T Y

Article11

11.1. Each family or taxon of lower rank with a particular circumscription,
position, and rank can bear only one correct name, special exceptions being
made for 9 familiesand 1 subfamily for which alternative names are permitted
(see Arts.18.5and19.7).However, the use of separate names forform-taxa of
fungi andforform-genera of fossil plantsis allowed under Arts.3.3and59.5.

11.2. For any taxon from family to genus inclusive, the correct name is the
earliest legitimate one with the same rank, except in cases of limitation of priority
by conservation (see Art.14) or where Arts.13.1(d),19.3,58, or59 apply.

11.3. For any taxon below the rank of genus, the correct name is the combina-
tionof the final epithet* of the earliest legitimatename of the taxon in the same
rank with the correct name of the genus or species to which it is assigned, except
(a) in cases of limitation of priority under Arts.13.1(d)and14, or(b) if the
resulting combination would be invalid under Art.32.1(b)or illegitimate under
Art.64, or(c) if Arts.22.1,26.1,58, or59rule that a different combination is to
be used.

11.4. The principle of priority is not mandatory for names of taxa above the
rank of family (but see Rec.16B).

* Here and elsewhere in this Code, the phrase final epithet refers to the last epithet in sequence in
one particular combination, whether that of a subdivision of a genus or of a species or of an
infraspecific taxon.

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Starting points

Article12

12.1. A name of a taxon has no status under this Code unless it is validly
published (see Arts.32–45).

S E C T I O N 4 . L I M I T A T I O N O F T H E P R I N C I P L E O F P R I O R I T Y

Article13

13.1. Valid publication of names for plants of the different groups is treated as
beginning at the following dates (for each group a work is mentioned which is
treated as having been published on the date given for that group):

Non-fossil plants:

(a) SPERMATOPHYTA and PTERIDOPHYTA, 1 May 1753 (Linnaeus,Species Planta-
rum ed. 1).

(b) MUSCI (theSphagnaceae excepted), 1 Jan. 1801 (Hedwig,Species Musco-
rum).

(c) SPHAGNACEAE and HEPATICAE, 1 May 1753 (Linnaeus,Species Plantarum
ed.1).

(d) FUNGI:(including Myxomycetesandlichen -forming fungi), 1 May 1753
     (Linnaeus, Species Plantarum ed. 1). Names in the Uredinales, Ustilaginales,
      and Gasteromycetesadopted byPersoon (Synopsis Methodica Fungorum,
      31 Dec. 1801)andnames ofFungi Caeteri(excluding Myxomycetes and
     lichen-forming fungi) adopted byFries (Systema Mycologicum, vols. 1 (1
      Jan. 1821)to3, and Elenchus Fungorum, vols. 1–2), are sanctioned, i.e., are
     treated as if conserved against earlier homonymsand competing synonyms.
      For nomenclatural purposes names given to lichens shall be considered as
      applying to their fungal component.

(e) ALGAE, 1 May 1753 (Linnaeus,Species Plantarum ed. 1). Exceptions:
      NOSTOCACEAE HOMOCYSTEAE, 1 Jan. 1892 (Gomont,Monographie des Oscil-
     lariées, Ann. Sci. Nat. Bot.ser. 7, 15: 263–368; 16: 91–264). The two parts of
      GomontsMonographie, which appeared in 1892 and 1893 respectively,
      are treated as having been published simultaneously on 1 Jan. 1892.
      NOSTOCACEAE HETEROCYSTEAE, 1 Jan. 1886 (Bornet& Flahault,Révision des
     Nostocacées hétérocystées, Ann. Sci. Nat. Bot.ser. 7, 3: 323–381; 4: 343–373;
      5: 51–129; 7: 177–262). The four parts of theRévision, which appeared in
      1886,1886, 1887, and 1888 respectively, are treated as having been published
      simultaneously on 1 Jan. 1886.
      DESMIDIACEAE, 1 Jan. 1848 (Ralfs,British Desmidieae).
      OEDOGNIACEAE, 1 Jan. 1900 (Hirn,Monographie und Iconographie der
     Oedogoniaceen, Acta Soc. Sci. Fenn. 27(1)).

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Conservation

Fossil plants:

(f) ALL GROUPS 31 Dec. 1820 (Sternberg,Flora der Vorwelt, Versuch 1: 1–24.t
1–13). Schlotheim,Petrefactenkunde, 1820, is regarded as published before
31 Dec. 1820.

13.2. The group to which a name is assigned for the purposes of this Article is
determined by the accepted taxonomic position of the type of the name.

Ex. 1. The genusPorella and its single species,P. pinnata, were referred by Linnaeus(1753) to the
Musci; if the type specimen ofP. pinnata is accepted as belonging to the Hepaticae, the names were
validly published in 1753.

Ex. 2. The lectotype ofLycopodium L.(1753) isL. clavatum L.(1753) and the type specimen of this is
currently accepted as a pteridophyte. Accordingly, although the genus is listed by Linnaeus among
the Musci, the generic name and the names of the pteridophyte species included by Linnaeus under it
were validly published in 1753.

13.3. For nomenclatural purposes, a name is treated as pertaining to anon-fossil
taxon unless its type is fossil in origin. Fossil material is distinguished fromnon-
fossil material by stratigraphic relations at the site of original occurrence. In
cases of doubtful stratigraphic relations,provisions fornon-fossil taxa apply.

13.4. Generic names which first appear in Linnaeus Species Plantarum ed. 1
(1753) and ed. 2 (1762–63) are associated with the first subsequent description
given under those names in Linnaeus Genera Plantarum ed. 5 (1754) and ed. 6
(1764) (see Art.41).The spelling ofthegeneric names includedin the Species
Plantarum ed. 1 is not to be altered because adifferent spelling has been used in
theGenera Plantarum ed. 5.

13.5. The two volumes of Linnaeus Species Plantarum ed. 1 (1753), which
appeared in May and August, 1753, respectively, are treated as having been
published simultaneously on the former date (1 May 1753).

Ex. 3. The generic namesThea L. Sp. Pl. 515 (May 1753) andCamellia L. Sp. Pl. 698 (Aug. 1753),
Gen. Pl. ed. 5. 311 (1754) are treated as having been published simultaneously in May 1753. Under
Art. 57 the combined genus bears the nameCamellia, since Sweet (Hort. Suburb. Lond. 157. 1818),
who was the first to unite the two genera, chose that name, citingThea as a synonym.

13.6. Names of anamorphs of fungi with a pleomorphic life cycle do not,
irrespective of priority, affect the nomenclatural status of the names of the
correlated holomorphs (see Art.59.4).

Article14

14.1. In order to avoid disadvantageous changes in the nomenclature offami-
lies,genera, and species entailed by the strict application of the rules, and
especially of the principle of priority in starting from the dates given in Art.13,
this Code provides, inAppendices II andIII, lists of names that are conserved
(nomina conservanda) and must be retained as useful exceptions.

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14	Conservation

14.2. Conservation aims at retention of those names which best serve stability of
nomenclature (see Rec.50E).Conservation of specific names is restricted to
species of major economic importance.

14.3. The application of both conserved and rejected names is determined by
nomenclatural types.

14.4. Aconserved nameof a family or genus is conserved against all other names
in the same rank based on the same type (nomenclatural synonyms, which are to
be rejected) whether these are cited in the corresponding list of rejected names or
not, and against those names based on different types (taxonomic synonyms)
that are cited in that list*.A conserved name of a species is conserved against all
names listed as rejected, and against all combinations based on the rejected
names.

14.5. When a conserved name competes with one or more other names based on
different types and against which it is not explicitly conserved, the earliest of the
competing names is adopted in accordance with Art.57.1 , except for conserved
family names (Appendix II ), which are conserved against unlisted names.

Ex. 1. If the genusWeihea Sprengel (1825) is united withCassipourea Aublet (1775), the combined
genus will bear the prior nameCassipourea, althoughWeihea is conserved andCassipourea is not.

Ex. 2. IfMahonia Nutt. (1818) is united withBerberis L. (1753), the combined genus will bear the
prior nameBerberis, althoughMahonia is conserved.

Ex. 3. Nasturtium R. Br. (1812) was conserved only against the homonymNasturtiumMiller (1754)
and the nomenclatural synonymCardaminum Moench (1794); consequently if reunited withRorippa
Scop. (1760) it must bear the nameRorippa.

14.6. When a name of ataxon has been conserved against an earlier name based
on a different type, the latter is to be restored, subject to Art.11, if it is considered
the name of ataxon at the same rank distinct from that of thenomen conservan-
dum except when the earlier rejected name is a homonym of the conserved name.

Ex. 4. The generic nameLuzuriaga Ruiz& Pavón (1802) is conserved against the earlier names
Enargea Banks& Sol. ex Gaertner (1788) andCallixene Comm. exA. L. Juss. (1789). If, however,
Enargea Banks& Sol. ex Gaertner is considered to be a separate genus, the nameEnargea is retained
for it.

14.7. Arejected name, or a combination based on a rejected name, may not be
restored for a taxon which includes the type of the corresponding conserved
name.

Ex. 5. Enallagma Baillon (1888) is conserved againstDendrosicus Raf. (1838), but not against
Amphitecna Miers (1868); ifEnallagma andAmphitecna are united, the combined genus must bear
the nameAmphitecna, although the latter is not explicitly conserved againstDendrosicus.

* The International Code of Zoological Nomenclature and the International Code of Nomenclature
of Bacteria use the terms objective synonym and subjective synonym for nomenclatural and
taxonomic synonym, respectively.

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Conservation

14.8. A name may be conserved with a different type from that designated by the
author or determined by application of the Code (see Art.10.3). A name with a
type so conserved (typ. cons.) is legitimate even if it would otherwise be illegiti-
mate under Art.63.When a name isconserved with a type different from that of
the original author, the author of the name as conserved, with the new type, must
be cited.

Ex. 6. Bulbostylis Kunth (1837), nom. cons. (nonBulbostylis Steven 1817). This is not to be cited as
Bulbostylis Steven emend. Kunth, since the type listed was not included inBulbostylis by Steven in
1817.

14.9. A conserved name, and the corresponding autonyms, are conserved against
all earlier homonyms.

Ex. 7. The generic nameSmithia Aiton (1789), conserved againstDamapana Adanson (1763), is
thereby conserved automatically against the earlier homonymSmithia Scop. (1777).

14.10. Anamecan be conservedin order to preserve a particular orthography. A
name so conserved is to be attributed without change of priority to the author
who validly published it, not to the author whose spelling is conserved.

Ex. 8. The spellingRhodymenia, used by Montagne (1839), has been conserved against the original
spellingRhodomenia, used by Greville (1830). The name is to be cited asRhodymenia Grev. (1830).

14.11. The lists of conserved names will remain permanently open for additions
and changes. Entries of conserved names cannot be deleted. Any proposal of an
additional name must be accompanied by a detailed statement of the cases both
for and against its conservation. Such proposals must be submitted to the
General Committee (seeDivision III), which will refer them for examination to
the committees for the various taxonomic groups.

Article15

15.1. Whena proposal forthe conservation(or rejection under Art.69) of
a name has been approved by the General Committee after study by the Commit-
tee for the taxonomic group concerned,retention (or rejection) of that name is
authorizedsubject to the decision of a later International Botanical Congress.

Recommendation15A

15A.1. Whena proposal forthe conservationor rejection ofa name has been referred to the
appropriate Committee for study,authors should follow existing usage as far as possible pending the
General Committees recommendation on the proposal.

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16	Higher taxa

C H A P T E R I I I . N O M E N C L A T U R E O F T A X A A C C O R D I N G T O

T H E I R R A N K

S E C T I O N1 . N A M E S O F T A X A A B O V E T H E R A N K O F F A M I L Y

Article16

16.1. Names of taxa above the rank of family are automatically typified if they
are based on generic names (see Art.10.5); for such automatically typified
names, the name ofa subdivisionwhich includes the type of the adopted name
of a division, thename ofa subclasswhich includes the type of the adopted name
of a class, and thename ofa suborderwhich includes the type of the adopted name
of an order, are to be based on the generic name equivalent to that type, but
without the citation of an authors name.

16.2. Where one of the stems-monado-, -cocco-, -nemato-, or-clado- asthe
second part of a generic name has been omitted before the termination-phyceae
or-phyta, the shortened class or division name is regarded as based on the generic
name in question if such derivation is obvious or is indicated at establishment of
the group name.

Ex. 1. RaphidophyceaeChadefaud ex P. C. Silva (1980) wasindicated by its author tobebased on
Raphidomonas F. Stein (1878).

Note 1. The principle of priority is not mandatory for names of taxa above the rank of family (Art.
11.4).

Recommendation16A

16A.1. The name of a division is taken either from distinctive characters of the division (descriptive
names) or froma name of an included genus; it should end in-phyta, except when it is a division of
fungi, in which case it should end in-mycota.

16A.2. The name of a subdivision is formed in a similar manner; it is distinguished from a divisional
name by an appropriate prefix or suffix or by the termination-phytina, except when it is a subdivision
offungi, in which case it should end in-mycotina.

16A.3. The name of a class or of a subclass is formed in a similar manner and should end as follows:

(a) In the Algae:-phyceae (class) and-phycidae (subclass);

(b) In the Fungi:-mycetes (class) and-mycetidae (subclass);

16A.4. When a name has been published with a termination not agreeing with this recommendation,
the termination may be changed to accord with it, without change of authors name or date of
publication.

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Families

17–18

Recommendation16B

16B.1. In choosing among typified names for a taxon above the rank of family, authors should
generally follow the principle of priority.

Article17

17.1. The name of an orderorsuborder is taken either from distinctive charac-
ters of the taxon (descriptive name) or from a legitimate name of an included
familybased on a generic name (automatically typified name). An ordinal name
of the second category is formed by adding the termination-alestothe stem of
thename of the genus. A subordinal name of the second category is similarly
formed, with the termination-ineae.

Ex. 1. Descriptive names of orders: Centrospermae, Parietales, Farinosae;of a suborder: Enantio-
blastae.

Ex. 2. Automatically typified names: Fucales, Polygonales, Ustilaginales; Bromeliineae, Malvineae.

17.2. Names intended as names of orders, but published with their rank denoted
by a term such as cohors, nixus, alliance, or Reihe instead oforder, are
treated as having been published as names of orders.

17.3. When the name of an order or suborder based ona name of a genus has
been published with an improper termination, this termination must be changed
to accord with the rule, without change of the authors nameor date of publica-
tion.

Recommendation17A

17A.1. Authors should not publish new names of orders for taxa of that rank which include a family
from whose name an existing ordinal name is derived.

S E C T I O N 2 . N A M E S O F F A M I L I E S A N D S U B F A M I L I E S ,

T R I B E S A N D S U B T R I B E S

Article18

18.1. The name of a family is a plural adjective used as a substantive; it is formed
by adding the termination-aceae to the stem of a legitimate name of an included
genus (see also Art.10). (For the treatment of final vowels of stems in composi-
tion, see Rec.73G).

Ex. 1. Rosaceae (fromRosa),Salicaceae (fromSalix),Plumbaginaceae (fromPlumbago).

18.2. Names intended as names of families, but published with their rank
denoted by one of the terms order (ordo) or natural order (ordo naturalis)
instead of family, are treated as having been published as names of families.

18.3. A name of a family based on the stem of an illegitimate generic name is

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19	Subdivisions of families

illegitimate unless conserved. Contrary to Art.32.1(b) such a name is validly
published if it complies with the other requirements for valid publication.

Ex. 2. Caryophyllaceae,nom. cons. (fromCaryophyllus Miller non L.);Winteraceae,nom. cons.
(fromWintera Murray, an illegitimate synonym ofDrimysForster & Forster f.).

18.4. When a name of a family has been published with an improper Latin
termination, the termination must be changed to conform with the rule, without
change of the authors nameor date of publication (see Art.32.5).

Ex. 3. Coscinodisceae Kütz. is to be accepted asCoscinodiscaceae Kütz. and not attributed to De
Toni, who first used the correct spelling (Notarisia 5: 915. 1890).

Ex. 4. Atherospermeae R. Br. is to be accepted asAtherospermataceae R. Br. and not attributed to
Airy Shaw (in Willis, Dict. Fl. Pl. ed. 7. 104. 1966), who first used the correct spelling, or to Lindley,
who used the spellingAtherospermaceae (Veg. Kingd. 300. 1846).

Ex. 5. However, Tricholomées Roze (Bull. Soc. Bot. France 23: 49. 1876) is not to be accepted as
Trichotomataceae Roze, because it has a French rather than a Latin termination.

18.5. The following names, sanctioned by long usage, are treated as validly
published:Palmae (Arecaceae; type,Areca L.);Gramineae (Poaceae; type,Poa
L.);Cruciferae (Brassicaceae; type,Brassica L.);Leguminosae (Fabaceae; type,
Faba Miller (=Vicia L. p.p.));Guttiferae (Clusiaceae; type,Clusia L.);Umbelli-
ferae (Apiaceae; type,Apium L.);Labiatae (Lamiaceae; type,Lamium L.);Com-
positae (Asteraceae; type,Aster L.). When thePapilionaceae (Fabaceae; type,
Faba Miller) are regarded as a family distinct from the remainder of theLegumi-
nosae, the namePapilionaceae is conserved againstLeguminosae (see Art.51.2).

18.6. The use, as alternatives, of the names indicated in parentheses in Art. 18.5
is authorized.

Article19

19.1. The name of a subfamily is a plural adjective used as a substantive; it is
formed by adding the termination-oideae to the stem of a legitimate name of an
included genus.

19.2. A tribe is designated in a similar manner, with the termination-eae, and a
subtribe similarly with the termination-inae.

19.3. The name of anysubdivision of a familythat includes the type of the
adopted, legitimate name of the family to which it is assigned is to be based on the
generic nameequivalent to that type, butnot followed by an authors name (see
Art.46).Such names are termed autonyms (Art.6.8; see also Art.7.18).

Ex. 1. The type of the familynameRosaceae A. L. Juss. isRosa L. and hence the subfamily and tribe
which includeRosa are to be calledRosoideae andRoseae.

Ex. 2. The typeof the familynamePoaceae Barnhart (nom. alt.,Gramineae A. L. Juss. — see Art.

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Subdivisions of families

18.5) isPoa L. and hence the subfamily and tribe which includePoa are to be calledPooideae and
Poëae.

Note 1. This provision applies only to the names of thosesubordinate taxa that include the type of
theadopted name of the family(but see Rec. 19A).

Ex. 3. The subfamily including the type of the familynameEricaceae A. L. Juss. (Erica L.) is called
Ericoideae, and the tribe including thistype is calledEriceae. However, the correct name of the tribe
including bothRhododendron L., the type of the subfamily nameRhododendroideae Endl., and
Rhodora L. isRhodoreae G. Don (the oldest legitimate name), and notRhododendreae.

Ex. 4. The subfamily of the familyAsteraceae Dumort. (nom. alt.,Compositae Giseke) including
Aster L., the type of the family name, is calledAsteroideae, and the tribe and subtribe includingAster
are calledAstereae andAsterinae, respectively. However, the correct name of the tribe including both
Cichorium L., the type of the subfamily nameCichorioideae Kitamura, andLactuca L. isLactuceae
Cass., notCichorieae, while that of the subtribe including bothCichorium andHyoseris L. is
Hyoseridinae Less., notCichoriinae (unless theCichoriaceae A. L. Juss. are accepted as a family
distinct fromCompositae).

19.4. The first valid publication of a nameof a subdivision of a familythat does
not include the type of theadopted, legitimate name of the family automatically
establishes thecorresponding autonym(see also Arts.32.6and57.3 ).

19.5. The name of a subdivision of a family may not be based on the same stem
of a generic name as is the name of the family or of any subdivision of the same
family unless it has the same type as that name.

19.6. When a name of a taxon assigned to one of the above categories has been
published with an improper Latin termination, such as-eae for a subfamily or
-oideae for a tribe, the termination must be changed to accord with the rule,
without change of the authors nameor date of publication (see Art.32.5).

Ex. 5. The subfamily nameClimacieae Grout (Moss Fl. N. Amer. 3: 4. 1928) is to be changed to
Climacioideae with rank and authors name unchanged.

19.7. When thePapilionaceae are included in the familyLeguminosae (nom.alt.,
Fabaceae; see Art.18.5) as a subfamily, the namePapilionoideaemay be used as
an alternative toFaboideae.

Recommendation19A

19A.1. If a legitimate name is not available for asubdivision of a family which includes the type of the
correct name of another taxonofhigher or lowerrank (e.g., subfamily, tribe, or subtribe), but not of
the family to which it is assigned, the new name of that taxon should be based on the same generic
name as the name of the higher or lower taxon.

Ex. 1. Three tribes of the familyEricaceae, none of which includes thetype of that familyname
(Erica L.), arePyroleae D. Don,Monotropeae D. Don, andVaccinieae D. Don. The names of the
later-described subfamiliesPyroloideae (D. Don) A. Gray,Monotropoideae (D. Don) A. Gray, and
Vaccinioideae (D. Don) Endl. are based on the same generic names.

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Genera

S E C T I O N 3 . N A M E S O F G E N E R A A N D S U B D I V I S I O N S O F G E N E R A

Article20

20.1. The name of a genus is a substantive in the singular number, or a word
treated as such. It may be taken from any source whatever, and may even be
composed in an absolutely arbitrary manner.

Ex. 1. Rosa, Convolvulus, Hedysarum, Bartramia, Liquidambar, Gloriosa, Impatiens, Rhododendron,
Manihot, Ifloga (an anagram ofFilago).

20.2. The name of a genus may not coincide with a technical term currently used
in morphology unless it was published before 1 Jan. 1912 and accompanied by a
specific name published in accordance with the binary system of Linnaeus.

Ex. 2. The generic nameRadicula Hill(1756) coincides with the technical termradicula (radicle)
and was not accompanied by a specific name in accordance with the binary system of Linnaeus. The
name is correctly attributed to Moench(1794), who first combined it with specific epithets, but at that
time he included in the genus the type of the generic nameRorippa Scop.(1760).Radicula Moench is
therefore rejected in favour ofRorippa.

Ex. 3. TuberWigg. : Fr., when published in 1780, was accompanied bya binary specific name (Tuber
gulosorum Wigg.) and is thereforevalidly published.

Ex. 4. The generic namesLanceolatus Plumstead (1952) andLobata V. J. Chapman (1952) coincide
with technical terms and are therefore not validly published.

Ex. 5. Names such asRadix, Caulis, Folium, Spina, etc., cannot now be validly published as generic
names.

20.3. The name of a genus may not consist of two words, unless these words are
joined by a hyphen.

Ex. 6. The generic nameUva ursi Miller(1754) as originally published consisted of two separate
words unconnected by a hyphen, and is therefore rejected; the name is correctly attributed to
Duhamel(1755) asUva-ursi (hyphened when published).

Ex. 7. However, names such asQuisqualis (formed by combining two words into one when original-
ly published),Sebastiano-schaueria, andNeves-armondia (both hyphened when originally published)
are validly published.

Note 1. The names of intergeneric hybrids are formed according to the provisions of Appendix I,
Art.H.6.

20.4. The following are not to be regarded as generic names:

(a) Words not intended as names.

Ex. 8. Anonymos Walter (Fl. Carol. 2, 4, 9, etc. 1788) is rejected as being a word applied to 28
different genera by Walter to indicate that they were without names.

Ex. 9. Schaenoides andScirpoides, as used by Rottbøll (Descr. Pl. Rar. Progr. 14, 27. 1772) to
indicate unnamed genera resemblingSchoenus andScirpus which he stated (on page 7) he intended to
name later, are token words and not generic names.Kyllinga Rottb. andFuirena Rottb. (1773) are the
first legitimate names of these genera.

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Subdivisions of genera

(b) Unitary designations of species.

Ex. 10. Ehrhart (Phytophylacium 1780, and Beitr. 4: 145-150. 1789) proposed unitary names for
various species known at that time under binary names, e.g.Phaeocephalum forSchoenus fuscus, and
Leptostachys forCarex leptostachys. These names, which resemble generic names, should not be
confused with them and are to be rejected, unless they have been published as generic names by a
subsequent author; for example, the nameBaeothryon, employed as a unitary name of a species by
Ehrhart, was subsequently published as a generic name by A. Dietrich.

Ex. 11. Necker in his Elementa Botanica, 1790, proposed unitary designations for his species
naturales. These names, which resemble generic names, are not to be treated as such, unless they
have been published as generic names by a subsequent author; for exampleAnthopogon, employed by
Necker for one of his species naturales, was published as a generic name by Rafinesque:Anthopogon
Raf. non Nutt.

Recommendation20A

20A.1. Authors forming generic names should comply with the following suggestions:

(a) To use Latin terminations insofar as possible.

(b) To avoid names not readily adaptable to the Latin language.

(c) Not to make names which are very long or difficult to pronounce in Latin.

(d) Not to make names by combining words from different languages.

(e) To indicate, if possible, by the formation or ending of the name the affinities or analogies of the
genus.

(f) To avoid adjectives used as nouns.

(g) Not to use a name similar to or derived from the epithet of one of the species of the genus.

(h) Not to dedicate genera to persons quite unconnected with botany or at least with natural science.

(i) To give a feminine form to all personal generic names, whether they commemorate a man or a
woman (see Rec.73B).

(j)   Not to form generic names by combining parts of two existing generic names, e.g.Hordelymus
       fromHordeum andElymus, because such names are likely to be confused withnothogeneric
      names (see Art.H.6).

Article21

21.1. The name of a subdivision of a genus is a combination of a generic name
and a subdivisional epithet connected by a term (subgenus, sectio, series, etc.)
denoting its rank.

21.2. The epithet is either of the same form as a generic name, or a plural
adjective agreeing in gender with the generic name and written with a capital
initial letter (see Art.32.5).

21.3. The epithet of a subgenus or section is not to be formed from the name of
the genus to which it belongs by addingthe prefixEu-.

Ex. 1. Costus subg.Metacostus; Ricinocarpos sect.Anomodiscus; Sapium subsect.Patentinervia;
Valeriana sect.Valerianopsis;Euphorbia sect.Tithymalus; Euphorhia subsect.Tenellae;Arenaria ser.
Anomalae; but notCarex sect.Eucarex.

Note 1. The use within the same genus of the same epithetin names of subdivisions of the genus, even
in different ranks, based on different types is illegitimate under Art.64.

Note 2. The names of hybrids with the rank of a subdivision of a genus are formed according to the
provisions of Appendix I, Art.H.7

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22	Subdivisions of genera

Recommendation21A

21A.1. When it is desired to indicate the name of a subdivision of the genus to which a particular
species belongs in connection with the generic name and specific epithet, its epithetshould be placed
in parentheses between the two; whendesirable, its rankmay alsobe indicated.

Ex. 1. Astragalus (Cycloglottis)contortuplicatus; Astragalus (Phaca) umbellatus; Loranthus (sect.
Ischnanthus)gabonensis.

Recommendation21B

21B.1. The epithet of a subgenus or section is preferably a substantive, that of a subsection or lower
subdivision of a genus preferably a plural adjective.

21B.2. Authors, when proposing new epithets for subdivisions of genera, should avoid those in the
form of a substantive when other co-ordinate subdivisions of the same genus have them in the form of
a plural adjective, and vice-versa. They should also avoid, when proposing an epithet for a
subdivision of a genus, one already used for a subdivision of a closely related genus, or one which is
identical with the name of such a genus.

Article22

22.1. Thename of anysubdivision of a genusthat includes the type of the
adopted, legitimate name of the genus to which it is assignedis to repeat that
generic name unaltered as its epithet, butnot followed by an authors name (see
Art.46).Such names are termed autonyms (Art.6.8; see also Art.7.18).

Note 1. This provision applies only to the names of those subordinate taxa that include the type of
the adopted name of the genus (butsee Rec. 22A).

22.2. The first valid publication of a name of a subdivision of a genusthat does
not include the type of theadopted, legitimate name of the genus automatically
establishes thecorresponding autonym(see also Arts.32.6 and57.3 ).

Ex. 1. The subgenus ofMalpighia L. which includes the lectotype of the generic name (M. glabra L.)
is calledMalpighia subg.Malpighia, and notMalpighia subg.Homoiostylis Niedenzu.

Ex. 2. The section ofMalpighia L. including the lectotype of the generic name is calledMalpighia
sect.Malpighia, and notMalpighia sect.Apyrae DC.

Ex. 3. However, the correct name of the section of the genusRhododendron L. which includes
Rhododendron luteum Sweet, the type ofRhododendron subg.Anthodendron (Reichenb.) Rehder, is
Rhododendron sect.Pentanthera G. Don, the oldest legitimate name for that section, and not
Rhododendron sect.Anthodendron.

22.3. The epithet in the name of a subdivision of a genus may not repeat
unchanged the correct name of the genus, except when the two names have the
same type.

22.4. When the epithet of a subdivision of a genus is identical with or derived
from the epithet of one of its constituent species, the type of the name of the
subdivision of the genusis the same as that of thespecies name, unless the
original author of the subdivisional name designated another type.

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Species

Ex. 4. The type ofEuphorbia subg.Esula Pers. isE. esula L.; the designation ofE. peplus L. as
lectotype by Croizat (Revista Sudamer. Bot. 6: 13. 1939) is rejected.

Ex. 5. The type ofLobelia sect.Eutupa Wimmer isL. tupa L.

22.5. When the epithet of a subdivision of a genus is identical with or derived
from the epithet of a specific name that is a later homonym, it is thetype of that
later homonym, whose correct name necessarily has a different epithet, that is the
nomenclatural type.

Recommendation22A

22A.1. A section including the type of the correct name of a subgenus, but not including the type of
the correct name of the genus, should, where there is no obstacle under the rules, be givena name with
the same epithet and type as the subgeneric name.

22A.2. A subgenus not including the type of the correct name of the genus should, where there is no
obstacle under the rules, be givena name with the same epithet and type asa name of one of its
subordinate sections.

Ex. 1. Instead of using a new name at the subgeneric level, Brizicky raisedRhamnus sect.Pseudofran-
gula Grubov to the rank of subgenus asRhamnus subg.Pseudofrangula (Grubov) Briz. The type of
both names is the same,R. alnifolia LHér.

S E C T I O N 4 . N A M E S O F S P E C I E S

Article23

23.1. The name of a species is a binary combination consisting of the name of the
genus followed by a single specific epithet. If an epithet consists of two or more
words, these are to be united or hyphened. An epithet not so joined when
originally published is not to be rejected but, when used, is to be united or
hyphened (see Art.73.9).

23.2. The epithetin the name of a species may be taken from any source
whatever, and may even be composed arbitrarily.

Ex. 1. Cornus sanguinea, Dianthus monspessulanus, Papaver rhoeas, Uromyces fabae, Fumaria gusso-
nei, Geranium robertianum, Embelia sarasiniorum, Atropa bella-donna, Impatiens noli-tangere, Adian-
tum capillus-veneris, Spondias mombin (an indeclinable epithet).

23.3. Symbols forming part of specific epithets proposed by Linnaeus must be
transcribed.

Ex. 2. Scandix pecten ♀ L. is to be transcribed asScandix pecten-veneris; Veronica anagallis ∇ L. is to
be transcribed asVeronica anagallis-aquatica.

23.4. The specific epithet may not exactly repeat the generic name with or
without the addition of a transcribed symbol (tautonym).

Ex. 3. Linaria linaria, Nasturtium nasturtium-aquaticum.

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22	Subdivisions of genera

23.5. The specific epithet, when adjectival in form and not used as a substantive,
agrees grammatically with the generic name (see Art.32.5).

Ex. 4. Helleborus niger, Brassica nigra, Verbascum nigrum;Vinca major, Tropaeolum majus; Rubus
amnicola, the specific epithet being a Latin substantive;Peridermium balsameum Peck, but also
Gloeosporium balsameae J. J. Davis, both derived from the epithet ofAbies balsamea, the specific
epithet of which is treated as a substantive in the second example.

23.6. The following are not to be regarded as specific epithets:

(a) Words not intended as epithets.

Ex. 5. Violaqualis Krocker (Fl. Siles. 2: 512, 517. 1790);Urticadubia? Forsskål (Fl. Aegypt.
-Arab. cxxi. 1775), the word dubia being repeatedly used in that work for species which could not
be reliably identified.

Ex. 6. Atriplex nova Winterl (Index Horti Bot. Univ. Pest. fol. A. 8, recto et verso. 1788), the word
nova being here used in connection with four different species ofAtriplex.

Ex. 7. However, inArtemisia nova A. Nelson (Bull. Torrey Bot. Club 27: 274. 1900),nova was
intended as a specific epithet, the species having been newly distinguished from others.

(b) Ordinal adjectives used for enumeration.

Ex. 8. Boletus vicesimus sextus,Agaricus octogesimus nonus.

(c) Epithets published in works in which the Linnaean system of binary nomen-
      clature for species is not consistently employed. Linnaeus is regarded as
      having used binary nomenclature for species consistently from 1753 on-
      wards, although there are exceptions, e.g.Apocynum fol. androsaemi L. (Sp.
      Pl. 213. 1753 ≡Apocynum androsaemifolium L. Sp. Pl. ed. 2. 311. 1762).

Ex. 9. The nameAbutilon album Hill (Brit. Herb. 49. 1756) is a descriptive phrase reduced to two
words, not a binary name in accordance with the Linnaean system, and is to be rejected: Hills other
species wasAbutilon flore flavo.

Ex. 10. Secretan (Mycographie Suisse. 1833) introduced a large number of new specific names, more
than half of them not binomials, e.g.Agaricus albus corticis,Boletus testaceus scaber,Boletus aereus
carne lutea. He is therefore considered not to have consistently used the Linnaean system of binary
nomenclature and none of the specific names, even those with a single epithet, in this work are validly
published.

Ex. 11. Otherworks in which the Linnaean system of binary nomenclature is not consistently
employed:Gilibert (Fl. Lit. Inch. 1781; Exerc. Phyt. 1792),Miller (Gard. Dict. Abr. ed. 4. 1754),W.
Kramer (Elench. Veg. 1756).

(d) Formulae designating hybrids (see Art.H.10.3).

Recommendation23A

23A.1. Names of men and women and also of countries and localities used as specific epithets should
be in the form of substantives in the genitive (clusii,porsildiorum, saharae) or of adjectives (clusianus,
dahuricus) (see also Art.73, Recs.73C andD).

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Infraspecific taxa

23A.2. The use of the genitive and the adjectival form of the same word to designate two different
species of the same genus should be avoided (e.g.Lysimachia hemsleyanaOliver andL. hemsleyi
Franchet).

Recommendation23B

23B.1. In forming specific epithets,authors should comply also with the following suggestions:

(a) To use Latin terminations insofar as possible.

(b) To avoid epithets which are very long and difficult to pronounce in Latin.

(c) Not to make epithets by combining words from different languages.

(d) To avoid those formed of two or more hyphened words.

(e) To avoid those which have the same meaning as the generic name (pleonasm).

(f) To avoid those which express a character common to all or nearly all the species of a genus.

(g) To avoid in the same genus those which are very much alike, especially those which differ only in
their last letters or in the arrangement of two letters.

(h) To avoid those which have been used before in any closely allied genus.

(i)   Not to adopt unpublished names found in correspondence, travellers notes, herbarium labels, or
       similar sources, attributing them to their authors, unless these authors have approved publica-
       tion.

(j) To avoid using the names of little-known or very restricted localities, unless the species is quite
local.

S E C T I O N 5 . N A M E S O F T A X A B E L O W T H E R A N K O F S P E C I E S

( I N F R A S P E C I F I C T A X A )

Article24

24.1. The name of an infraspecific taxon is a combination of the name of a
species and an infraspecific epithet connected by a term denoting its rank.

Ex. 1. Saxifraga aizoon subformasurculosa Engler & Irmscher. This can also be cited asSaxifraga
aizoon var.aizoon subvar.brevifolia formamulticaulis subformasurculosa Engler & Irmscher; in this
way a full classification of the subforma within the species is given.

24.2. Infraspecific epithets are formed as those of species and, when adjectival in
form and not used as substantives, they agree grammatically with the generic
name (see Art.32.5).

Ex. 2. Trifolium stellatum formananum (notnana).

24.3. Infraspecific epithets such astypicus, originalis, originarius, genuinus, ve-
rus, andveridicus, purporting to indicate the taxon containing the nomenclatural
type of the next higher taxon, are inadmissible and cannot be validly published
except where they repeat the specific epithet because Art.26 requires their use.

24.4. The use of a binary combinationinstead of an infraspecificepithet is not
admissible.Contrary to Art.32.1(b), names so constructed are validly published
but are to be altered to the proper form without change ofthe authors nameor
date of publication.

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25–26

Infraspecific taxa

Ex. 3. Salvia grandiflora subsp.S. willeana Holmboe is to be cited asSalvia grandiflora subsp.
willeana Holmboe.

Ex. 4. Phyllerpa prolifera var.Ph. firma Kütz. is to be altered toPhyllerpa prolifera var.firma
Kütz.

24.5. Infraspecific taxa within different species may bear the same epithets; those
within one species may bear the same epithets as other species (but see Rec.24B).

Ex. 5. Rosa jundzillii var.leioclada andRosa glutinosa var.leioclada; Viola tricolor var.hirta in spite
of the previous existence of a different species namedViola hirta.

Note 1. The use within the same species of the same epithet for infraspecific taxa, even if they are of
different rank, based on different types is illegitimate under Art.64.3.

Recommendation24A

24A.1. Recommendations made for specific epithets (Recs.23A,B) apply equally to infraspecific
epithets.

Recommendation24B

24B.1. Authors proposing new infraspecific epithets should avoid those previously used for species
in the same genus.

Article25

25.1. For nomenclatural purposes, a species or any taxon below the rank of
species is regarded as the sum of its subordinate taxa, if any.In fungi, a
holomorph (see Art.59.4 ) also includes its correlated form-taxa.

Ex. 1. WhenMontia parvifolia (DC.) Greene is treated as containing two subspecies, the nameM.
parvifolia applies to the sum of these subordinate taxa. Under this taxonomic treatment, one must
writeM. parvifolia (DC.) Greene subsp.parvifolia if only that part ofM. parvifolia which includes its
nomenclatural type and excludes the type of the name of the other subspecies (M. parvifolia subsp.
flagellaris (Bong.) Ferris) is meant.

Article26

26.1. The name of any infraspecific taxonthat includes the type of theadopted,
legitimate name of the speciesto which it is assigned is torepeatthe specific
epithet unaltered as its final epithet, butnot followed by an authors name (see
Art.46).Such names are termed autonyms(Art.6.8; see also Art.7.18).

Ex. 1. The combinationLobelia spicata var.originalis McVaugh, applying to a taxon which includes
the type of the nameLobelia spicata Lam., is to be replaced byLobelia spicata Lam. var.spicata.

Note 1. This provision applies only to the names of those subordinate taxa that include the type of
the adopted name of the species (but see Rec. 26A).

26.2. The first valid publication of a name of an infraspecific taxon that does not
include the type of the adopted, legitimate name of the species automatically
establishes thecorresponding autonym(see also Arts.32.6and57.3 ).

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Cultivated plants

27–28

Ex. 2. The publication of the nameLycopodium inundatum var.bigelovii Tuckerman (1843) auto-
matica established the name of another variety,Lycopodium inundatum L. var.inundatum, the type
of which is that of the nameLycopodium inundatum L.

Ex. 3. Utricularia stellaris L. f. (1781) includesU. stellaris var.coromandeliana A. DC. (1844) andU.
stellaris L. f. var.stellaris (1844) automatically established at the same time. WhenU. stellaris is
included inU. inflexa Forsskål (1775) as a variety the correct name of the variety, under Art.57.3, is
U. inflexa var.stellaris (L. f.) P. Taylor (1961).

Recommendation26A

26A.1. A variety including the type of the correct name of a subspecies, but not including the type of
the correct name of the species, should, where there is no obstacle under the rules, be givena name
with the same epithet and type as the subspeciesname.

26A.2. A subspecies not including the type of the correct name of the species should, where there is
no obstacle under the rules, be given a name with the same epithet and type asa name of one of its
subordinate varieties.

26A.3. A taxon of lower rank than variety which includes the type of the correct name of a subspecies
or variety, but not the type of the correct name of the species, should, where there is no obstacle under
the rules, be givena name with the same epithet and type asthe name of the subspecies or variety. On
the other hand, a subspecies or variety which does not include the type of the correct name of the
species should not be givena name with the same epithet asthe name of one of its subordinate taxa
below the rank of variety.

Ex. 1. Fernald treatedStachys palustris subsp.pilosa (Nutt.) Epling as composed of five varieties, for
one of which (that including the type of subsp.pilosa) he made the combinationS. palustris var.pilosa
(Nutt.) Fern., there being no legitimate varietal name available.

Ex. 2. There being no legitimate name available at the rank of subspecies, Bonaparte made the
combinationPteridium aquilinum subsp.caudatum (L.) Bonap., using the same epithet that Sadebeck
had used earlier in the combinationP. aquilinum var.caudatum (L.) Sadeb. (both names based on
Pteris caudata L.). Each name islegitimate, and both can be used, as by Tryon, who treatedP.
aquilinum var.caudatum as one of four varieties under subsp.caudatum.

Article27

27.1. The final epithet in the name of an infraspecific taxon may not repeat
unchanged the epithet of the correct name of the species to which the taxon is
assigned except when the two names have the same type.

S E C T I O N 6 . N A M E S O F P L A N T S I N C U L T I V A T I O N

Article28

28.1. Plants brought from the wild into cultivation retain the names that are
applied to the same taxa growing in nature.

28.2. Hybrids, including those arising in cultivation, may receive names as
provided in Appendix I (see also Arts.40, and50).

Note 1. Additional, independentdesignations for plants used in agriculture, forestry, and horticul-

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28	Cultivated plants

ture (and arising either in nature or cultivation)are dealt with in the International Code of
Nomenclature for Cultivated Plants, where regulations are provided fortheir formation and use.
However, nothing precludes the use for cultivated plants of names published in accordance with the
requirements of the International Code of Botanical Nomenclature.

Note 2. Epithets published in conformity with the International Code of Botanical Nomenclature
may be used as cultivar epithets under the rules of the International Code of Nomenclature for
Cultivated Plants, when this is considered to be the appropriate status for the groups concerned.
Otherwise,cultivar epithetspublished on or after1 January 1959in conformity with the Internation-
al Code of Nomenclature for Cultivated Plants are required to be fancy names markedly different
fromepithets of names in Latin form governed by the International Code of Botanical Nomenclature
(see that Code, Art. 27).

Ex. 1. Cultivar names:Taxus baccata VariegataorTaxus baccata cv. Variegata (based onT.
baccata var.variegata Weston),Phlox drummondii Sternenzauber,Viburnum × bodnantense
Dawn.

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Effective publication

C H A P T E R I V . E F F E C T I V E A N D V A L I D P U B L I C A T I O N

S E C T I O N 1 . C O N D I T I O N S A N D D A T E S O F E F F E C T I V E P U B L I C A T I O N

Article29

29.1. Publication is effected, under this Code, only by distribution of printed
matter (through sale, exchange, or gift) to the general public or at least to
botanical institutions with libraries accessible to botanists generally. It is not
effected by communication of new names at a public meeting, by the placing of
names in collections or gardens open to the public, or by the issue of microfilm
made from manuscripts, type-scripts or other unpublished material.

Ex. 1. Cusson announced his establishment of the genusPhysospermum in a memoir read at the
Société des Sciences de Montpellier in 1770, and later in 1782 or 1783 at the Société de Médecine de
Paris, but its effective publication dates from 1787 in the Mémoires de la Société Royale de Médecine
de Paris 5(1): 279.

29.2. Offer for sale of printed matter that does not exist does not constitute
effective publication.

29.3. Publication by indelible autograph before 1 Jan. 1953 is effective.

Ex. 2. Salvia oxyodon Webb& Heldr. was effectively published in July 1850 in an autograph
catalogue placed on sale (Webb& Heldreich, Catalogus Plantarum Hispanicarum . . . ab A. Blanco
lectarum. Paris, July 1850, folio).

Ex. 3. H. Léveillé, Flore du Kouy Tchéou (1914–1915), a work lithographed from the handwritten
manuscript, is effectively published.

29.4. For the purpose of this Article, handwritten material, even though repro-
duced by some mechanical or graphic process (such as lithography, offset, or
metallic etching), is still considered as autographic.

29.5. Publication on or after 1 Jan. 1953 in tradesmens catalogues or non-
scientific newspapers, and on or after 1 Jan. 1973 in seed-exchange lists, does not
constitute effective publication.

Recommendation29A

29A.1. It isstrongly recommended thatauthors avoid publishing new namesand descriptionsof new

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30–32

Valid publication

taxa in ephemeralprinted matter of anykind, in particular that which is multiplied in restricted and
uncertain numbers, where thepermanence of the text may be limited, where the effective publication
in terms of number of copies is not obvious, or where the printed matter is unlikely to reach the
general public. Authors should also avoid publishing new names and descriptionsin popular
periodicals, in abstracting journals, or on correction slips.

Article30

30.1. The date of effective publication is the date on which the printed matter
became available as defined in Art. 29. In the absence of proof establishing some
other date, the one appearing in the printed matter must be accepted as correct.

Ex. 1. Individual parts of WilldenowsSpecies Plantarum were published as follows: 1(1), 1797; 1(2),
1798; 2(1), 1799; 2(2), 1799 or January 1800; 3(1) (to page 850), 1800; 3(2) (to page 1470), 1802; 3(3)
(to page 2409), 1803 (and later than MichauxsFloraBoreali-Americana); 4(1) (to page 630), 1805;
4(2), 1806; these dates, which are partly in disagreement with those on the title-pages of the volumes,
areaccepted as thecorrect dates ofeffective publication.

30.2. When separates from periodicals or other works placed on sale are issued
in advance, the date on the separate is accepted as the date of effective publica-
tion unless there is evidence that it is erroneous.

Ex. 2. Publication in separates issued in advance: the names of theSelaginella species published by
Hieronymus in Hedwigia 51: 241-272 (1912) were effectively published on 15 Oct. 1911, since the
volume in which the paper appeared states (p. ii) that the separate appeared on that date.

Recommendation30A

30A.1. The date on which the publisher or his agent delivers printed matter to one of the usual
carriers for distribution to the public should be accepted as its date ofeffective publication.

Article31

31.1. The distribution on or after 1 Jan. 1953 of printed matter accompanying
exsiccata does not constitute effective publication.

Note 1. If the printed matter is also distributed independently of the exsiccata, this constitutes
effective publication.

Ex. 1. Works such as Schedae operis. . .plantae finlandiae exsiccatae, Helsingfors 1. 1906, 2. 1916, 3.
1933, 1944, or Lundell & Nannfeldt, Fungi exsiccati suecici etc., Uppsala 1-. . ., 1934-. . ., distributed
independently of the exsiccata, whether published before or after 1 Jan. 1953, are effectively
published.

S E C T I O N 2 . C O N D I T I O N S A N D D A T E S O F V A L I D P U B L I C A T I O N O F N A M E S

Article32

32.1. In order to be validly published, a name of a taxon(autonyms excepted)
must(a) be effectively published (see Art. 29)on or after the starting-point date
of the respective group (Art.13.1);(b) have a form which complies with the

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Valid publication

provisions of Arts.16–27 and Arts.H.6–7;(c) be accompanied by a description
or diagnosis or by a reference (direct or indirect) to a previously and effectively
published description or diagnosis (except as provided in Art.H.9); and(d)
comply with the special provisions of Arts.33–45.

Ex. 1. Egeria Néraud (in Gaudichaud, Voy. Uranie, Bot. 25, 28. 1826), published without a
description or a diagnosis or a reference to a former one, wasnot validly published.

Ex. 2. The nameLoranthus macrosolen Steudel originally appeared without a description or diagno-
sis on the printed tickets issued about the year 1843 with Sect. II. no. 529, 1288, of Schimpers
herbarium specimens of Abyssinian plants; it was not validly published, however, until A. Richard
(Tent. Pl. Abyss. 1: 340. 1847) supplied a description.

32.2. A name validly published by reference to a previously and effectively
published description or diagnosis is to be typified by an element selected from
the context of the validating description or diagnosis.

Ex. 3. Since the nameAdenanthera bicolor Moon (1824) is validated solely by reference to Rum-
phius, Herbarium Amboinense 3: t. 112, the type of the name, in the absence of the specimen from
which it was figured, is the illustration referred to. It is not the specimen, at Kew, collected by Moon
and labelledAdenanthera bicolor.

32.3. A diagnosis of a taxon is a statement of that which in the opinion of its
author distinguishes the taxon from others.

32.4. An indirect reference is a clear indication, by the citation of the authors
name or in some other way, that a previously and effectively published descrip-
tion or diagnosis applies.

Ex. 4. Kratzmannia Opiz (in Berchtold & Opiz, Oekon.-Techn. Fl. Böhm. 1/2: 398. 1836) is publish-
ed with a diagnosis, but it was not definitely accepted by the author and is therefore not validly
published. It is accepted definitely in Opiz (Seznam 56. 1852), but without any description or
diagnosis. The citation ofKratzmannia O. includes an indirect reference to the previously published
diagnosis in 1836.

Ex. 5. Opiz published the name of the genusHemisphace (Bentham) Opiz (1852) without a descrip-
tion or diagnosis, but as he wroteHemisphace Benth. he indirectly referred to the previously
effectively published description by Bentham (Labiat. Gen. Spec. 193. 1833) ofSalvia sect.Hemi-
sphace.

Ex. 6. The new combinationCymbopogon martini (Roxb.) W. Watson (1882) is validated by the
addition of the number 309, which, as explained at the top of the same page, is the running-number
of the species (Andropogon martini Roxb.) in Steudel (Syn. Pl. Glum. 1: 388. 1854). Although the
reference to the basionymAndropogon martini is indirect, it is perfectly unambiguous.

32.5. Names published with an incorrect Latin termination but otherwise in
accordance with this Code are regarded as validly published; they are to be
changed to accord with Arts.17–19,21,23, and24, without change of the
authors nameor date of publication.

32.6. Autonyms (Art.6.8) are accepted as validly published names, dating from
the publication in which they were established (see Arts.19.4,22.2,26.2),
whether or not they appear in print in that publication.

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33	Valid publication

Note 1. In certain circumstances an illustration with analysis is accepted as equivalent to a descrip-
tion (see Arts.42 and44).

Note 2. For names of plant taxa that were originally not treated as plants, see Art.45.

Recommendation32A

32A.1. A name should not be validated solely by a reference to a description or diagnosis published
before 1753.

Recommendation32B

32B.1. The description or diagnosis of any new taxon should mention the points in which the taxon
differs from its allies.

Recommendation32C

32C.1. Authors should avoid adoption of a name which has been previously but not validly
published for a different taxon.

Recommendation32D

32D.1. In describing new taxa, authors should, when possible, supply figures with details of structure
as an aid to identification.

32D.2. In the explanation of the figures, it is valuable to indicate the specimen(s) on which they are
based.

32D.3. Authors should indicate clearly and precisely the scale of the figures which they publish.

Recommendation32E

32E.1. The description or diagnosis of parasitic plants should always be followed by an indication of
the hosts, especially those of parasitic fungi. The hosts should be designated by their scientific names
and not solely by names in modern languages, the applications of which are often doubtful.

Article33

33.1. A combination(autonyms excepted) is not validly published unless the
author definitely indicates that the epithet or epithets concerned are to be used in
that particular combination.

Ex. 1. In LinnaeussSpecies Plantarum the placing of the epithet in the margin opposite the name of
the genus clearly indicates the combination intended. The same result is attained in Millers
Gardeners Dictionary, ed. 8, by the inclusion of the epithet in parentheses immediately after the name
of the genus, in SteudelsNomenclator Botanicus by the arrangement of the epithets in a list headed
by the name of the genus, and in general by any typographical device which indicates that an epithet is
associated with a particular generic orspecific name.

Ex. 2. Rafinesques statement underBlephilia that Le type de ce genre est laMonarda ciliata Linn.
(J. Phys. Chim. Hist. Nat. Arts 89: 98. 1819) does not constitute publication of the combination
Blephilia ciliata, since he did not indicate that that combination was to be used. Similarly, the
combinationEulophus peucedanoides is not to be ascribed to Bentham on the basis of the listing of
Cnidium peucedanoides, H. B.et K. underEulophus (in Bentham & Hooker, Gen. Pl. 1: 885. 1867).

33.2. A new combination, or an avowed substitute (nomen novum), published on
or after 1 Jan. 1953, for a previously and validly published name is not validly
published unless its basionym (name-bringing or epithet-bringing synonym) or

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Valid publication

the replaced synonym (when a new name is proposed) is clearly indicated and a
full and direct reference given to its author andplace of valid publication with
page or plate reference and date. Bibliographic errors of citation do not invali-
date publication of a new combination.

Ex. 3. In transferringEctocarpus mucronatus Saund. toGiffordia, Kjeldsen & Phinney (Madroño 22:
90. 27 Apr. 1973) cited the basionym and its author but without reference to its place of valid
publication. They later (Madroño 22: 154. 2 Jul. 1973) validated the binomialGiffordia mucronata
(Saund.) Kjeldsen & Phinney by giving a full and direct reference to the place of valid publication of
the basionym.

Ex. 4. Aronia arbutifolia var.nigra (Willd.) Seymour (1969) was published as a new combination
Based onMespilus arbutifolia L. var.nigra Willd., in Sp. Pl. 2: 1013. 1800. Willdenow treated these
plants in the genusPyrus, notMespilus, and publication was in 1799, not 1800; these errors are
treated as bibliographic errors of citation and do not invalidate the new combination.

Ex. 5. The combinationTrichipteris kalbreyeri was proposed by Tryon (Contr. Gray Herb. 200: 45.
1970) with a full and direct reference toAlsophila kalbreyeri C. Chr. (Index Filic. 44. 1905). This,
however, was not the place of valid publication of the basionym, which had previously been
published, with the same type, by Baker (Summ. New Ferns 9. 1892). Tryons bibliographic error of
citation does not invalidate this new combination, which is to be cited asTrichipteris kalbreyeri
(Baker) Tryon.

Ex. 6. The combinationLasiobelonium corticale was proposed by Raitviir (1980) with a full and
direct reference toPeziza corticalis Fr. (Syst. Mycol. 2: 96. 1822). This, however, was not the place of
valid publication of the basionym, which, under the Code operating in 1980, was in Mérat (Nouv. Fl.
Env. Paris ed. 2, 1: 22. 1821), and under the present Code is in Persoon (Obs. Mycol. 1: 28. 1796).
Raitviirs bibliographic error of citation does not invalidate the new combination, which is to be cited
asLasiobelonium corticale (Pers.) Raitviir.

33.3. Mere reference to theIndex Kewensis, theIndex of Fungi, or any work
other than that in which the name was validly published does not constitute a full
and direct reference to the original publication of a name.

Note 1. The publication of a name for a taxon previously known under a misapplied name must be
valid under Arts.32–45. This procedure is not the same as publishing an avowed substitute (nomen
novum) for a validly published but illegitimate name (Art.72.1(b)), the type of which is necessarily the
same as that of the name which it replaced (Art.7.9).

Ex. 7. Sadleria hillebrandii Robinson(1913) was introduced as a nom. nov. forSadleria pallida
Hilleb. Fl. Haw. Is. 582. 1888. Not Hook. & Arn. Bot. Beech. 75. 1832. Since the requirements of
Arts.32–45 were satisfied (for valid publicationprior to 1935, simple reference to a previous
descriptionin any language is sufficient), the name is validly published. It is, however, to be
considered the name of a new species, validated by the citation of the misapplication ofS. pallida
Hooker & Arn. by Hillebrand, and not anomen novum as stated; hence, Art.7.9 does not apply.

Ex. 8. Juncus bufonius var.occidentalis F. J. Herm. (U.S. Forest Serv. Techn. Rep. RM-18: 14. 1975)
was published as a nom. et stat. nov. forJ. sphaerocarpus auct. Am., non Nees. Since there is no
Latin diagnosis nor designation of type, nor reference to any previous publication providing these
requirements, the name is not validly published.

33.4. A name given to a taxon whose rank is at the same time denoted by a
misplaced term (one contrary to Art.5) is treated as not validly published,

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34	Valid publication

examples of such misplacement being a form divided into varieties, a species
containing genera, or a genus containing families or tribes.

Ex. 9. The names tribusInvoluta Huth and tribusBrevipedunculata Huth (Bot. Jahrb.Syst. 20:365,
368. 1895) are not validly published, since Huth misapplied the term tribus to a category of lower
rank than section, within the genusDelphinium.

Ex. 10. Gandoger, in hisFlora Europae (1883–1891), applied the term species (espèce) and used
binary nomenclature for two categories of taxa of consecutive rank, the higher rank being equivalent
to that of species in contemporary literature. He misapplied the term species to the lower rank and the
names of these taxa (Gandogers microspecies) are not validly published.

33.5. An exception to Art. 33.4 is made for names of thesubdivisions of genera
termed tribes (tribus) in FriessSystema Mycologicum, which are treated as
validly publishednames of subdivisions of genera.

Ex. 11. Agaricus tribusPholiota Fr. (1821) is a validly published basionym for the generic name
Pholiota (Fr.) P. Kummer (1871).

Article34

34.1. A name is not validly published(a) when it is not accepted by the author in
the original publication;(b) when it is merely proposed in anticipation of the
future acceptance of the group concerned, or of a particular circumscription,
position, or rank of the group (so-called provisional name);(c) when it is merely
mentioned incidentally;(d) when it is merely cited as a synonym;(e) by the mere
mention of the subordinate taxa included in the taxon concerned.

34.2. Art. 34.1(a) does not apply to names published with a question mark or
other indication of taxonomic doubt, yet published and accepted by the author.
Art. 34.1 (b) does not apply to names for anamorphs of fungi published in
holomorphic genera in anticipation of the discovery of a particular kind of
teleomorph (see Art. 59,Ex. 2).

34.3. By incidental mention of a new name or combination is meant mention
by an author who does not intend to introduce the new name or combination
concerned.

Ex. 1. (a) The name of the monotypic genusSebertia Pierre (ms.) was not validly published by
Baillon (Bull.Mens. Soc. Linn. Paris 2: 945. 1891) because he did not accept it. Although he gave a
description of the taxon, he referred its only speciesSebertia acuminata Pierre (ms.) to the genus
Sersalisia R. Br. asSersalisia ?acuminata; under the provision of Art. 34.2 this combination is validly
published. The nameSebertia Pierre (ms.) was later validly published by Engler(1897).

Ex. 2. (a) The names listed in the left-hand column of the Linnaean thesis Herbarium Amboinense
defended by Stickman (1754) were not accepted by Linnaeus upon publication and are not validly
published.

Ex. 3. (a) (b) The generic nameConophyton Haw., suggested by Haworth (Rev. Pl. Succ. 82. 1821)
forMesembryanthemum sect.Minima Haw. (Rev. Pl. Succ. 81. 1821) in the words If this section
proves to be a genus, the name ofConophyton would be apt, was not validly published, since
Haworth did not adopt that generic name nor accept that genus. The correct name for the genus is
Conophytum N. E. Br.(1922).

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Valid publicatio

Ex. 4. (d)Acosmus Desv. (in Desf., Cat. Pl. Horti Paris. 233. 1829), cited as a synonym of the generic
nameAspicarpa Rich., was not validly published thereby.

Ex. 5. (d)Ornithogalum undulatum hort. Bouch. (in Kunth, Enum. Pl. 4: 348. 1843), cited as a
synonym underMyogalum boucheanum Kunth, was not validly published thereby; when transferred
toOrnithogalum, this species is to be calledO. boucheanum (Kunth) Ascherson(1866).

Ex. 6. (d)Erythrina micropteryx Poeppig was not validly published by being cited as a synonym of
Micropteryx poeppigiana Walp. (1850); the species concerned, when placed underErythrina, is to be
calledE. poeppigiana (Walp.) Cook(1901).

Ex. 7. (e) The family nameRhaptopetalaceae Pierre (Bull.Mens. Soc. Linn. Paris 2: 1296. May
1897), which was accompanied merely by mention of constituent genera,Brazzeia,Scytopetalum,
andRhaptopetalum, was not validly published, as Pierre gave no description or diagnosis; the family
bears the later nameScytopetalaceae Engler(Oct. 1897), which was accompanied by a description.

Ex. 8. (e)The generic nameIbidium Salisb. (Trans. Hort. Soc. London 1: 291. 1812) was published
merely with the mention of four included species. As Salisbury supplied no generic description or
diagnosis, hisIbidium isnot validlypublished.

34.4. When, on or after 1 Jan. 1953, two or more different names (so-called
alternative names) are proposed simultaneously for the same taxon by the same
author, none of them is validly published.This rule does not apply in those cases
where the same combination is simultaneously used at different ranks, either for
an infraspecific taxon within a species or for a subdivision of a genus within a
genus (see Recs.22A.1–2,26A.1–3).

Ex. 9. The species ofBrosimum described by Ducke (Arch. Jard. Bot. Rio de Janeiro 3: 23–29. 1922)
were published with alternative names underPiratinera added in a footnote (pp. 23–24). The
publication of these names, being effected before 1 Jan. 1953, is valid.

Ex. 10. Euphorbia jaroslavii Polj. (Bot. Mater. Gerb. Bot.Inst. Komarova Akad. Nauk SSSR 15:
155. tab. 1953) was published with an alternative name,Tithymalus jaroslavii. Neither name was
validly published. However, one of the names,Euphorbia yaroslavii (with a different transliteration of
the initial letter), was validly published by Poljakov(1961), who effectively published it with a new
reference to the earlier publication and simultaneously rejected the other name.

Ex. 11. Description ofMalvastrum bicuspidatum subsp.tumidum S. R. Hill var.tumidum, subsp. et
var. nov. (Brittonia 32: 474. 1980) simultaneously validated bothM. bicuspidatum subsp.tumidum S.
R. Hill andM. bicuspidatum var.tumidum S. R. Hill.

Note 1. The name of a fungal holomorph and that of a correlated anamorph (see Art.59), even if
validated simultaneously, are not alternative names in the sense of Art. 34.4. They have different
types and do not pertain to the same taxon: the circumscription of the holomorph is considered to
include the anamorph, but not vice versa.

Ex. 12. Lasiosphaeria elinorae Linder (1929), the name of a fungal holomorph, and the
simultaneously published name of a correlated anamorph,Helicosporium elinorae Linder, are both
valid, and both can be used under Art.59.5.

Recommendation34A

34A.1. Authors should avoid publishing or mentioning in their publications unpublished names
which they do not accept, especially if the persons responsible for these names have not formally
authorized their publication (see Rec.23B.1(i)).

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Valid publication

Article35

35.1. A new name or combination published on or after 1 Jan. 1953 without a
clear indication of the rank of the taxon concerned is not validly published.

35.2. A new name or combination published before 1 Jan. 1953 without a clear
indication of rank is validly published provided that all other requirements for
valid publication are fulfilled; it is, however, inoperative in questions of priority
except for homonymy (see Art.64.4). If it is a new name, it may serve as a
basionym or replaced synonym for subsequent combinations or avowed substi-
tutes in definite ranks.

Ex. 1. The groupsSoldanellae,Sepincoli,Occidentales, etc., were published without any indication
of rank under the genusConvolvulus by House(Muhlenbergia 4: 50. 1908). These names are validly
published but they are not in any definite rank and have no status in questions of priority except that
they may act as homonyms.

Ex. 2. In the genusCarex, the epithetScirpinae was published for an infrageneric taxon of no stated
rank by Tuckerman (Enum. Caric. 8. 1843); this was assigned sectional rank by Kükenthal (in
Engler, Pflanzenr. 38 (IV.20): 81. 1909) and if recognized at this rank is to be cited asCarex sect.
Scirpinae (Tuckerman) Kükenthal.

35.3. If in a given publication prior to 1 Jan. 1890 only one infraspecific rank is
admitted it is considered to be that of variety unless this would be contrary to the
statements of the author himself in the same publication.

35.4. In questions of indication of rank, all publications appearing under the
same title and by the same author, such as different parts of a Flora issued at
different times (but not different editions of the same work), must be considered
as a whole, and any statement made therein designating the rank of taxa included
in the work must be considered as if it had been published together with the first
instalment.

Article36

36.1. In order to be validly published, a name of a new taxon of plants, the algae
and all fossils excepted, published on or after 1 Jan. 1935 must be accompanied
by a Latin description or diagnosis or by a reference to a previously and
effectively published Latin description or diagnosis (but see Art.H. 9).

Ex. 1. The namesSchiedea gregoriana Degener(Fl. Hawaiiensis, fam. 119. 1936, Apr. 9) andS.
kealiae Caum & Hosaka(Occas. Pap. Bernice Pauabi Bishop Mus. 11(23): 3. 1936, Apr. 10) were
proposed for the same plant; the type of the former is a part of the original material of the latter. Since
the nameS. gregoriana is not accompanied by a Latin description or diagnosis it is not validly
published; the laterS. kealiae is legitimate.

36.2. In order to be validly published, a name of a new taxon of non-fossil algae
published on or after 1 Jan. 1958 must be accompanied by a Latin description or
diagnosis or by a reference to a previously and effectively published Latin
description or diagnosis.

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37–40

Recommendation36A

36A.1. Authors publishing names of new taxa ofnon-fossil plants should give or cite a full
description in Latin in addition to the diagnosis.

Article37

37.1. Publication on or after 1 Jan. 1958 of the name of a new taxon of the rank
of family or below is valid only when the nomenclatural type is indicated (see
Arts.7–10; but see Art. H.9,Note 1 forthe names of certain hybrids).

Recommendation37A

37A.1. The indication of the nomenclatural type should immediately follow the Latin description or
diagnosis and should be given by the insertion ofthe Latin word typus (or holotypus, etc.)
immediately before or after the particulars of the type so designated.

Recommendation37B

37B.1. When the type of a name of a new taxon is a specimen, the place where it is permanently
conserved should be indicated.

Article38

38.1. In order to be validly published, a name of a new taxon of fossil plants of
specific or lower rank published on or after 1 Jan. 1912 must be accompanied by
an illustration or figure showing the essential characters, in addition to the
description or diagnosis, or by a reference to a previously and effectively pub-
lished illustration or figure.

Article39

39.1. In order to be validly published, a name of a new taxon ofnon-fossil algae
of specific or lower rank published on or after 1 Jan. 1958 must be accompanied
by an illustration or figure showing the distinctive morphological features, in
addition to the Latin description or diagnosis, or by a reference to a previously
and effectively published illustration or figure.

Recommendation39A

39A.1. The illustration or figure required by Art. 39 should be prepared from actual specimens,
preferably including the holotype.

Article40

40.1. In order to be validly published, names of hybrids of specific or lower rank
with Latin epithets must comply with the same rulesas names of non-hybrid taxa
of the same rank.

Ex. 1. The nameNepeta × faassenii Bergmans (Vaste Pl. ed. 2. 544. 1939) with a description in
Dutch, and in Gentes Herb. 8: 64 (1949) with a description in English, is not validly published, not
being accompanied by or associated with a Latin description or diagnosis. The name
Nepeta × faassenii Bergmans ex Stearn(1950) is validly published, being accompanied by a Latin
description with designation of type.

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41	Valid publication

Ex. 2. The nameRheum × cultorum Thorsrud & Reis. (Norske Plantenavr. 95. 1948), being here a
nomen nudum, is not validly published.

Ex. 3. The nameFumaria × salmonii Druce (List Brit. Pl. 4. 1908) is not validly published, because
only its presumed parentageF. densiflora × F. officinalis is stated.

Note 1. For names of hybrids of the rank of genus or subdivision of a genus, see Art.H. 9

40.2. For purposes of priority, names in Latin form given to hybrids are subject
to the same rules as are those of non-hybrid taxa of equivalent rank.

Ex. 4. The name × Solidaster Wehrh. (1932) antedates the name × Asterago Everett(1937) for the
hybridAster × Solidago.

Ex. 5. The name × Gaulnettya W. J. Marchant (1937) antedates the name × Gaulthettya Camp
(1939) for the hybridGaultheria × Pernettya.

Ex. 6. Anemone × hybrida Paxton (1848) antedatesA. × elegans Decne. (1852), pro sp., as the
binomial for the hybrids derived fromA. hupehensis × A. vitifolia.

Ex. 7. In 1927, Aimée Camus (Bull. Mus. Hist. Nat. (Paris) 33: 538. 1927) published the name
Agroelymus as the generic name of an intergeneric hybrid, without a Latin diagnosis or description,
mentioning only the names of the parents involved (Agropyron andElymus). Since this name was not
validly published under the Code then in force (Stockholm 1950), Jacques Rousseau, in 1952 (Mém.
Jard. Bot. Montréal 29: 10-11), published a Latin diagnosis. However, the date of valid publication of
the name × Agroelymus under this Code(Art.H. 9) is 1927, not 1952, and the name also antedates
× Elymopyrum Cugnac (Bull. Soc. Hist. Nat. Ardennes 33: 14. 1938) which is accompanied by a
statement of parentage and a description in French but not Latin.

Article41

41.1. In order to be validly published, a name of a familymust be accompanied
(a) by a description or diagnosis of the family, or(b) by a reference (direct or
indirect) to a previously and effectively published description or diagnosis of a
familyorsubdivision of a family.

41.2. In order to be validly published, a name of a genus must be accompanied
(a) by a description or diagnosis of the genus(but see Art. 42), or(b) by a
reference (direct or indirect) to a previously and effectively published description
or diagnosis ofa genus or subdivision of a genus.

Ex. 1. Validly published generic names:CarphaleaA. L. Juss., accompanied by a generic descrip-
tion;ThuspeinantaT. Durand, accompanied by a reference to the previously described genus
Tapeinanthus Boiss. (non Herbert);Aspalathoides (DC.)K. Koch, based on a previously described
section,Anthyllis sect.Aspalathoides DC.;Scirpoides Scheuchzer ex Séguier (Pl. Veron. Suppl. 73.
1754), accepted there but without a generic description, validated by indirect reference (through the
title of the book and a general statement in the preface) to the generic diagnosis and further direct
references in Séguier(Pl. Veron. 1: 117. 1745).

Note 1. An exception to Art. 41.2 is made for the generic names first published by Linnaeus in
Species Plantarum ed. 1 (1753) and ed. 2 (1762–1763), which are treated as having been validly
published on those dates (see Art.13.4).

Note 2. In certain circumstances, an illustration with analysis is accepted as equivalent to a generic
description (see Art. 42.2).

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Valid publication

42–43

Article42

42.1. The names of a genusand a speciesmay be simultaneously validatedby
provision of a single description (descriptio generico-specifica) or diagnosis,even
though this may have been intended as onlygeneric orspecific, if all of the
following conditions obtain:(a) the genus is at that timemonotypic;(b) no
other names (at any rank) have previously been validly published based on the
same type; and(c) the names of the genus and species otherwise fulfil the
requirements for valid publication. Reference to an earlier description or diagno-
sis is not accepted as provision of such a description or diagnosis.

Note 1. In this context a monotypic genus is one for which a single binomial is validly published,
even though the author may indicate that other species are attributable to the genus.

Ex. 1. Strophioblachia fimbriicalyx Boerl. is a new species without separate definition, assigned to
the monotypic new genusStrophioblachia. Both names are validly published with a combined generic
and specific description.

Ex. 2. Piptolepis phillyreoides Bentham is a new species assigned to the monotypic new genus
Piptolepis published with a combined generic and specific description.

Ex. 3. In publishing the namePhaelypea without a generic description P. Browne (Civ. Nat. Hist.
Jamaica 269. 1756) included and described a single species, but he gave the species a phrase-name and
did not provide a valid binomial. Art. 42 does not therefore apply and the namePhaelypea is not
validly published.

42.2. Prior to1 Jan. 1908 an illustration with analysis, or fornon-vascular plants
a single figure showing details aiding identification, is acceptable, for the purpose
of this Article, in place of a written description or diagnosis.

Note 2. An analysis in this context is a figure or group of figures, commonly separate from the main
illustration of the plant (though usually on the same page or plate), showing details aiding identifica-
tion, with or without a separate caption.

Ex. 4. The generic namePhilgamia Baillon (1894) was validly published, as it appeared on a plate
with analysis of the only included species,P. hibbertioides Baillon, and was published before 1 Jan.
1908.

Article43

43.1. A name of a taxon below the rank of genus is not validly published unless
the name of the genus or species to which it is assigned is validly published at the
same time or was validly published previously.

Ex. 1. Suaeda baccata,S. vera, and names for four other species ofSuaeda were published with
diagnoses and descriptions by Forsskål (Fl. Aegypt.-Arab. 69–71. 1775), but he provided no
diagnosis or description for the genus: these specific names were therefore, like the generic name, not
validly published by him.

Ex. 2. In 1880, Müller Argoviensis (Flora 63: 286) published the new genusPhlyctidia with the
speciesP. hampeana n. sp.,P. boliviensis (=Phlyctis boliviensis Nyl.),P. sorediiformis (=Phlyctis
sorediiformis Kremp.),P. brasiliensis (=Phlyctis brasiliensis Nyl.), andP. andensis (=Phlyctis

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Valid publication

andensis Nyl.). These specific names are, however, not validly published in this place, because the
generic namePhlyctidia was not validly published; Müller gave no generic description or diagnosis
but only a description and a diagnosis of the new speciesP. hampeana. This description and diagnosis
cannot validate the generic name as adescriptio generico-specifica under Art.42 since the new genus
was not monotypic.Valid publication of the namePhlyctidia was by Müller(1895),who provided a
short generic diagnosis. The only species mentioned here wereP. ludoviciensis n. sp. andP. boliviensis
(Nyl.). The latter combination was validly published in 1895 by the reference to the basionym.

Note 1. This Article applies also to specific and other epithets published under words not to be
regarded as generic names (see Art.20.4).

Ex. 3. The binary combinationAnonymos aquatica Walter (Fl. Carol. 230. 1788) is not validly
published. The correct name for the species concerned isPlanera aquatica J. F. Gmelin (1791), and
the date of the name, for purposes of priority, is 1791. The species must not be cited asPlanera
aquatica (Walter) J. F. Gmelin.

Ex. 4. The binary combinationScirpoides paradoxus Rottb. (Descr. Pl. Rar. Progr. 27. 1772) is not
validly published sinceScirpoides in this context is a word not intended as a generic name. The first
validly published name for this species isFuirena umbellata Rottb.(1773).

Article44

44.1. The name of a species or of an infraspecific taxon published before 1 Jan
1908 is validly published if it is accompanied only by an illustration with analysis
(see Art. 42, Note 2).

Ex. 1. Panax nossibiensis Drake(1896)was validly published on a plate with analysis.

44.2. Single figures ofnon-vascular plants showing detailsaiding identification
are considered as illustrations with analysis(see Art. 42, Note 2).

Ex. 2. Eunotia gibbosa Grunow(1881), a name of a diatom, was validly publishedby provision of a
single figure of the valve.

Article45

45.1. The date of a name is that of its valid publication. When the various
conditions for valid publication are not simultaneously fulfilled, the date is that
on which the last is fulfilled.However, the name must always be explicitly
accepted in the place of its validation. A name published on or after 1 Jan. 1973
for which the various conditions for valid publication are not simultaneously
fulfilled is not validly published unless a full and direct reference is given to the
places where these requirements were previously fulfilled.

Ex. 1. The nameClypeola minor was first published in the Linnaean thesis Flora Monspeliensis
(1756), in a list of names preceded by numerals but without an explanation of the meaning of these
numerals and without any other descriptive matter; when the thesis was reprinted in vol. 4 of the
Amoenitates Academicae (1759), a statement was added explaining that the numbers referred to
earlier descriptions published in Magnols Botanicon Monspeliense. However, the nameClypeola
minor was absent from the reprint, being no longer accepted by Linnaeus, and is not therefore validly
published.

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Valid publication

Ex. 2. Alyssum gionae was one of several new species published by Quézel & Contandriopoulos
(Naturalia Monspel. Sér. Bot. 16: 89–149. 1965) with a Latin diagnosis but without citation of a type.
Later (Taxon 16: 240. 1967) they designated a type specimen for that name, accompanied by a
reference to the earlier description and diagnosis. Although this reference was not full and direct,
lacking the page number,Alyssum gionae Quézel & Contandr. was, in 1967, validly published.

45.2. A correction of the original spelling of a name (see Art.73) does not affect
its date of valid publication.

Ex. 3. The correction of the orthographic error inGluta benghas L. (Mant. 293. 1771) toGluta
renghas L. does not affect the date of publication of the name even though the correction dates only
from 1883 (Engler in A. DC. & C. DC., Monogr. Phan. 4: 225).

45.3. For purposes of priority only legitimate names are taken into considera-
tion (see Arts.11,63–67). However, validly published earlier homonyms, whe-
ther legitimate or not, shall cause rejection of their later homonyms (unless the
latter are conserved).

45.4. If a taxon originally assigned to a group not covered by this Code is treated
as belonging to a group of plantsother than algae, the authorship and dateofany
of itsnames are determined by the firstpublication that satisfies the requirements
forvalid publication under thisCode. If the taxon is treated as belonging to the
algae, any of its names need satisfyonly therequirements of the pertinent non-
botanicalcode for status equivalent to valid publicationunder the botanical
Code(but see Art.65, regarding homonymy).

Ex. 4. Amphiprora Ehrenb. (1843)is an available* name for a genus of animalsfirst treated as
belonging to the algae by Kützing(1844).Amphiprora has priority in botanical nomenclature from
1843, not 1844.

Ex. 5. Petalodinium J. Cachon & M. Cachon (Protistologica 5: 16. 1969) is available under the
International Code of Zoological Nomenclature as the name of a genus of dinoflagellates. When the
taxon is treated as belonging to the algae, its name retains its original authorship and date even
though the original publication lacked a Latin diagnosis.

Ex. 6. Labyrinthodyction Valkanov (Progr. Protozool. 3: 373. 1969), although available under the
International Code of Zoological Nomenclature as the name of a genus of rhizopods, is not valid
when the taxon is treated as belonging to the fungi because the original publication lacked a Latin
diagnosis.

Ex. 7. Protodiniferidae Kofoid & Swezy (Mem. Univ. Calif. 5: 111. 1921), available under the
International Code of Zoological Nomenclature, is validly published as a name of a family of algae
with its original authorship and date but with the termination-idae changed to-aceae (in accordance
with Arts.18.4 and32.5).

Recommendation45A

45A.1. Authorsusing newnames in works written in a modern language (floras, catalogues, etc.)
should simultaneously comply with the requirements of valid publication.

* The word available in the International Code of Zoological Nomenclature is equivalent to
validly published in the International Code of Botanical Nomenclature.

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46	Citation

Recommendation45B

45B.1. Authors should indicate precisely the dates of publication of their works. In a work appearing
in parts the last-published sheet of the volume should indicate the precise dates on which the different
fascicles or parts of the volume were published as well as the number of pages and plates in each.

Recommendation45C

45C.1. On separately printed and issued copies of works published in a periodical, the name of the
periodical, the number of its volume or parts, the original pagination,and the date (year, month, and
day) should be indicated.

S E C T I O N 3 . C I T A T I O N O F A U T H O R S N A M E S A N D O F L I T E R A T U R E F O R

P U R P O S E S O F P R E C I S I O N

Article46

46.1. For the indication of the name of a taxon to be accurate and complete, and
in order that the date may be readily verified, it is necessary to cite the name of the
author(s) who validly published the name concerned unless the provisions for
autonyms apply (Arts.19.3,22.1, and26.1;seealsoArt.16.1).

Ex. 1. RosaceaeA. L. Juss.,Rosa L.,Rosa gallica L.,Rosa gallica var.eriostyla R. Keller,Rosa
gallica L. var.gallica.

Recommendation46A

46A.1. Authors names put after names of plants may be abbreviated, unless they are very short. For
this purpose, particles are suppressed unless they are an inseparable part of the name, and the first
letters are given without any omission (Lam. forJ. B. P. A. Monet Chevalier de Lamarck, but De
Wild. forE. De Wildeman).

46A.2. If a name of one syllable is long enough to make it worth while to abridge it, the first
consonants only are given (Fr. for Elias Magnus Fries); if the name has two or more syllables, the first
syllable and the first letter of the following one are taken, or the two first when both are consonants
(Juss. for Jussieu, Rich. for Richard).

46A.3. When it is necessary to give more of a name to avoid confusion between names beginning
with the same syllable, the same system is to be followed. For instance, two syllables are given
together with the one or two first consonants of the third; or one of the last characteristic consonants
of the name is added (Bertol. for Bertoloni, to distinguish it from Bertero; Michx. for Michaux, to
distinguish it from Micheli).

46A.4. Given names or accessory designations serving to distinguish two botanists of the same name
are abridged in the same way (Adr. Juss. for Adrien de Jussieu, Gaertner f. for Gaertner filius, J. F.
Gmelin for Johann Friedrich Gmelin, J. G. Gmelin for Johann Georg Gmelin, C. C. Gmelin for Carl
Christian Gmelin, S. G. Gmelin for Samuel Gottlieb Gmelin, Müll. Arg. for Jean Müller of Aargau).

46A.5. When it is a well-established custom to abridge a name in another manner, it is best to
conform to it (L. for Linnaeus, DC. for de Candolle, St.-Hil. for Saint-Hilaire,R. Br. for Robert
Brown).

Recommendation46B

46B.1. In citing the author of the scientific name of a taxon, the romanization of the authors name(s)
given in the original publication should normally be accepted. Where an author failed to give a
romanization, or where an author has at different times used different romanizations, then the

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Citation

romanization known to be preferred by the author or that most frequently adopted by the author
should be accepted. In the absence of such information the authors name should be romanized in
accordance with an internationally available standard.

46B.2 Authors of scientific names whose personal names are not written in Roman letters should
romanize their names, preferably (but not necessarily) in accordance with an internationally avail-
able standard and, as a matter of typographic convenience, without diacritical signs. Once authors
have selected the romanization of their personal names, they should use it consistently thereafter.
Whenever possible, authors should not permit editors or publishers to change the romanization of
their personal names.

Recommendation46C

46C.1. When a name has been published jointly by two authors, the names of both should be cited,
linked by means of the wordet or by an ampersand (&).

Ex. 1. Didymopanax gleasonii Britton et Wilson (or Britton & Wilson).

46C.2. When a name has been published jointly by more than two authors, the citation should be
restricted to that of the first one followed byet al.

Ex. 2. Lapeirousia erythrantha var.welwitschii (Baker) Geerinck, Lisowski, Malaisse & Symoens
(Bull. Soc. Roy. Bot. Belgique 105: 336. 1972) should be cited asL. erythrantha var.welwitschii
(Baker) Geerinck etal.

Recommendation46D

46D.1. When a name with a description or diagnosis (or reference to a description or diagnosis)
supplied by one author is published in a work by another author, the wordin should be used to
connect the names of the two authors. In such cases the name of the author who supplied the
description or diagnosis is the most important and should be retained when it is desirable to
abbreviate such a citation.

Ex. 1. Viburnum ternatum Rehder in Sargent, Trees and Shrubs 2: 37(1907), orV. ternatum Rehder;
Teucrium charidemi Sandw. in Lacaita, Cavanillesia 3: 38(1930), orT. charidemi Sandw.

Recommendation46E

46E.1. When an author who validly publishes a name ascribes it to another person, the correct
author citation is the name of the actual publishing author, but the name of the other person,
followed by the connecting wordex, may be inserted before the name of thepublishing author, if
desired. The same holds for names of garden origin ascribed to hort. (hortulanorum).

Ex. 1. Gossypium tomentosum Seemann orG. tomentosum Nutt. ex Seemann;Lithocarpus polysta-
chyus (A. DC.) Rehder orL. polystachyus (Wall. ex A. DC.) Rehder;Orchis rotundifolia Pursh orO.
rotundifolia Banks ex Pursh;Carex stipata Willd. orC. stipata Muhlenb. ex Willd.;Gesneria donklarii
Hooker orG. donklarii hort. ex Hooker.

46E.2. When an author who validly publishes a name ascribes it to an author who published the
name before the starting point of the group concerned (see Art.13.1), the author citation may
include, when such indication is considered useful or desirable, the name of the pre-starting-point
author followed byex as in Rec. 46E.1.

Ex. 2. Lupinus L. orLupinus Tourn. exL.;Euastrum binale Ralfs orE. binale Ehrenb. ex Ralfs.

Recommendation46F

46F.1. Authors of new names of taxa should not use the expressionnobis (nob.) or a similar
reference to themselves as an author citation but should cite their own names in each instance.

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Citation

Article47

47.1. An alteration of the diagnostic characters or of the circumscription of a
taxon without the exclusion of the type does not warrant the citation of the name
of an author other than the one who first published its name.

Examples: see under Art.51.

Recommendation47A

47A.1. When an alteration as mentioned in Art. 47 has been considerable, the nature of the change
may be indicated by adding such words, abbreviated where suitable, asemendavit (emend.)
(followed by the name of the author responsible for the change),mutatis characteribus (mut. char.).
pro parte (p.p.),excluso genere orexclusis generibus (excl. gen.),exclusa specie orexclusis
speciebus (excl. sp.),exclusa varietate orexclusis varietatibus (excl. var.),sensu amplo (s. ampl.).
sensu stricto (s. str.), etc.

Ex. 1. Phyllanthus L. emend. Müll. Arg.;Globularia cordifolia L. excl. var. (emend. Lam.).

Article48

48.1. When an authoradopts an existing name but explicitly excludes its original
type, he is considered to have published a later homonym that must be ascribed
solely to him.Similarly, when an author who adopts a name refers to an apparent
basionym but explicitly excludes its type, he is considered to have published a
new namethat must be ascribed solely to him. Explicit exclusion can be effected
by simultaneous explicit inclusion of the type in a different taxon by the same
author (see also Art.59.6).

Ex. 1. Sirodot (1872)placed the type ofLemanea Bory (1808)inSacheria Sirodot (1872); hence
Lemanea,as treated by Sirodot (1872), is to be cited asLemanea Sirodotnon Bory and notas
Lemanea Bory emend. Sirodot.

Ex. 2. The nameAmorphophallus campanulatus, published by Decaisne, was apparently based on
Arum campanulatum Roxb. However, the type of the latter was explicitly excluded by Decaisne, and
the name is to be cited asAmorphophallus campanulatus Decne., not asAmorphophallus campanulatus
(Roxb.) Decne.

Note 1. Misapplication of a new combination to a different taxon, but without explicit exclusion of
the type of the basionym, is dealt with under Arts.55.2 and56.2.

Note 2. Retention of a name in a sense that excludes the type can be effected only by conservation
(see Art.14.8).

Article49

49.1. When a genus or a taxon of lower rank is altered in rank but retains its
name or epithet, the authorof the earlier,epithet-bringing legitimate name (the
author of the basionym) must be cited in parentheses, followed by the name of
the author who effected the alteration (the author of the new name). The same
holds when a taxon of lower rank than genus is transferred to another genus or
species, with or without alteration of rank.

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Citation

Ex. 1. Medicago polymorpha var.orbicularis L. when raised to the rank of species becomesMedicago
orbicularis (L.) Bartal.

Ex. 2. Anthyllis sect.Aspalathoides DC. raised to generic rank, retaining the epithetAspalathoides as
its name, is cited asAspalathoides (DC.)K. Koch.

Ex. 3. Cineraria sect.Eriopappus Dumort. (Fl. Belg. 65. 1827) when transferred toTephroseris
(Reichenb.) Reichenb. is cited asTephroseris sect.Eriopappus (Dumort.) Holub (Folia Geobot.
Phytotax. Bohem. 8: 173. 1973).

Ex. 4. Cistus aegyptiacus L. when transferred toHelianthemum Miller is cited asHelianthemum
aegyptiacum (L.) Miller.

Ex. 5. Fumaria bulbosavar.solida L. (1753)was elevated to specific rank asF.solida (L.) Miller
(1771). The name of thisspecieswhen transferred toCorydalis isto becited asC.solida (L.)Clairv.
(1811), notC.solida (Miller)Clairv.

Ex. 6. However,Pulsatilla montana var.serbica W. Zimmerm. (Feddes Repert.Spec. Nov. Regni
Veg. 61: 95. 1958), originally placed underP.montana subsp.australis (Heuffel) Zam., retains the
same author citation when placed underP.montana subsp.dacica Rummelsp. (see Art.24.1) and is
not cited as var.serbica (W. Zimmerm.) Rummelsp. (Feddes Repert. 71: 29. 1965).

Ex. 7. Salix subsect.Myrtilloides C. Schneider (Ill. Handb. Laubholzk. 1: 63. 1904), originally
placed underS. sect.Argenteae Koch, retains the same author citation when placed underS. sect.
Glaucae Pax and is not cited asS. subsect.Myrtilloides (C. Schneider) Dorn (Canad. J. Bot. 54: 2777.
1976).

Article50

50.1. When the status of a taxonat the rank of species or below is altered tothe
hybridcategory (nothotaxon, see Art.H.3)of corresponding rank(Art.H.10.2),
or vice versa, the name of the original authoris citedand may be followed by an
indication in parentheses of the original status.Subsequently, and if the context
appears to permit it, the indication of original status may be omitted.

Ex. 1. Stachys ambiguaSmith was published as a species. If regarded as a hybrid, it is cited asStachys
× ambiguaSmith (pro sp.).

Ex. 2. The binary nameSalix × glaucops Andersson was published as the name of a hybrid. Later,
Rydberg (Bull. New York Bot. Gard. 1: 270. 1899) altered the status of the taxon to that of a species.
If this view is accepted, the name is cited asSalix glaucops Andersson (pro hybr.).

S E C T I O N 4 . G E N E R A L R E C O M M E N D A T I O N S O N C I T A T I O N

Recommendation50A

50A.1. In the citation of a name published as a synonym, the words as synonym orpro syn. should
be added.

50A.2. When an author has published as a synonym a manuscript name of another author, the word
ex should be used in citations to connect the names of the two authors (see Rec.46E.1).

Ex. 1. Myrtus serratus, a manuscript name of Koenig published by Steudel as a synonym ofEugenia
laurina Willd., should be cited thus:Myrtus serratus Koenig ex Steudel, pro syn.

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50	Citation

Recommendation50B

50B.1. In the citation of anomen nudum, its status should be indicated by adding the wordsnomen
nudum or nom. nud.

Ex. 1. Carex bebbii Olney (Car. Bor.-Am. 2: 12. 1871), published without a diagnosis or description,
should be cited as anomen nudum.

Recommendation50C

50C.1. The citationof a laterhomonym should be followed by the name of the author of the earlier
homonym preceded by the wordnon, preferably with the date of publication added. In some
instances it will be advisable to cite also anyother homonyms, preceded by the wordnec.

Ex. 1. Ulmus racemosa Thomas, Amer. J. Sci. Arts 19: 170 (1831), non Borkh. 1800;Lindera Thunb,
Nov. Gen. Pl. 64 (1783), non Adanson 1763;Bartlingia Brongn., Ann. Sci. Nat. (Paris) 10: 373 (1821)
non Reichenb. 1824 necF. Muell. 1882.

Recommendation50D

50D.1. Misidentifications should not be included in synonymies but added afterthem. A misapplied
name should be indicated by the wordsauct. non followed by the name of the original author and
the bibliographic reference of the misidentification.

Ex. 1. Ficus stortophylla Warb. in Warb. & De Wild., Ann. Mus. CongoBelge, B, Bot.ser.4, 1: 32
(1904).F. irumuensis De Wild., Pl. Bequaert. 1: 341 (1922).F. exasperata auct. non Vahl: De Wild. et
T. Durand, Ann. Mus. CongoBelge, B, Bot.ser.2, 1: 54 (1899); De Wild.,Miss. Em. Laurent 26
(1905);T.Durand & H. Durand, Syll. Fl. Congol. 505 (1909).

Recommendation50E

50E.1. If a genericor specific name is accepted as anomen conservandum (see Art.14 andApp. III)
the abbreviationnom. cons. should be added to the citation.

Ex. 1. Protea L., Mant.Pl. 187 (1771),nom. cons., non L. 1753;Combretum Loefl. (1758),nom.
cons. (syn. priusGrislea L. 1753).

50E.2. If it is desirable to indicate the sanctioned status of the names of fungi adopted by Persoon or
Fries (see Art.13.1(d)), : Pers. or : Fr. should be added to the citation.

Ex. 2. Boletus piperatus Bull. : Fr.

Recommendation50F

50F.1. Except as provided in Art.75,a name cited in synonymy should be spelled exactly as
published by its author. If any explanatory words are required, these should be inserted in brackets. If
a name is adopted with alterations from the form as originally published, it is desirable that in full
citations the exact original form should be added, preferably between quotation marks.

Ex. 1. Pyrus calleryana Decne. (Pyrus maireiH. Léveillé, Repert. Spec. Nov.Regni Veg. 12: 189.
1913,Pirus).

Ex. 2. Zanthoxylum cribrosum Sprengel, Syst.Veg. 1: 946(1825),Xanthoxylon. (Zanthoxylum
caribaeum var.floridanum (Nutt.) A. Gray, Proc. Amer. Acad.Arts 23: 225. 1888,Xanthoxylum).

Ex. 3. Spathiphyllum solomonense Nicolson, Amer. J. Bot. 54: 496 (1967),solomonensis.

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51–52

C H A P T E R V. R E T E N T I O N , C H O I C E , A N D R E J E C T I O N O F

N A M E S A N D E P I T H E T S

S E C T I O N 1. R E T E N T I O N O F N A M E S O R E P I T H E T S W H E N T A X A A R E

R E M O D E L L E D O R D I V I D E D

Article51

51.1. An alteration of the diagnostic characters or of the circumscription of a
taxon does not warrant a change in its name, except as may be required (a) by
transference of the taxon (Arts.54–56), or (b) by its union with another taxon of
the same rank (Arts.57,58), or (c) by a change of its rank (Art.60).

Ex. 1. The genusMyosotis as revised by R. Brown differs from the original genus of Linnaeus, but
the generic name has not been changed, nor is a change allowable, since the type ofMyosotis L.
remains in the genus; it is cited asMyosotis L. or asMyosotis L. emend. R. Br. (see Art.47, Rec.47A).

Ex. 2. Various authors have united withCentaurea jacea L. one or two species which Linnaeus had
kept distinct; the taxon so constituted is calledCentaurea jacea L. sensu amplo orCentaurea jacea L.
emend. Cosson & Germ., emend. Vis., or emend. Godron, etc.; any new name for this taxon, such as
Centaurea vulgaris Godron, is superfluous and illegitimate.

51.2. An exception to Art.51.1 is made for the family namePapilionaceae (see
Art.18.5).

Article52

52.1. When a genus is divided into two or more genera, the generic name, if
correct, must be retained for one of them.Ifa type was originally designated the
generic name must be retained for the genus including thattype.If no type has
been designated, a type must be chosen (see Guide for the determination of types,
p.79).

Ex. 1. The genusDiceraForster& Forsterf. was divided by Rafinesque into the two generaMisipus
andSkidanthera. This procedure is contrary to the rules: the nameDicera must be kept for one of the
genera, and it is now retained for that part ofDiceraincluding the lectotype,D. dentata.

Ex. 2. Among the sections which have been recognized in the genusAesculus L. areAesculus sect.
Aesculus, sect.Pavia (Miller)Walp., sect.Macrothyrsus (Spach)K. Koch, and sect.Calothyrsus
(Spach)K. Koch, the last three of which were regarded as distinct genera by the authors cited in
parentheses. In the event of these four sections being treated as genera, the nameAesculus must be
kept for the first of them, which includesAesculus hippocastanum L.,the type of the generic name.

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53–55

Transference of taxa

Article53

53.1. When a species is divided into two or more species, the specificname, if
correct, must be retained for one of them. If a particular specimen, description,
or figure was originally designated as the type, the specificname must be retained
for the species including that element.If no type has been designated, a type must
be chosen (see Guide for the determination of types, p.79).

Ex. 1. Arabis beckwithii S. Watson(1887) was based on specimens which represented at least two
species in the opinion of Munz, who basedA. shockleyi Munz(1932) on one of the specimens cited by
Watson, retaining the nameA. beckwithii for the others (one of which may be designated as lectotype
ofA. beckwithii).

Ex. 2. Hemerocallis lilioasphodelus L.(1753) was originally treated by Linnaeus as consisting of two
varieties:var.flava(flavus) andvar.fulva(fulvus). In 1762 he recognized these as distinct species,
calling themH. flava andH. fulva.The original specific epithetwas reinstated for one of these by
Farwell (Amer. Midl. Naturalist 11: 51. 1928) and the two species are correctly namedH. lilioaspho-
delus L. andH. fulva (L.) L.

53.2. The same rule applies to infraspecific taxa, for example, to a subspecies
divided into two or more subspecies, or to a variety divided into two or more
varieties.

S E C T I O N 2 . R E T E N T I O N O F E P I T H E T S O F T A X A B E L O W T H E R A N K O F

G E N U S O N T R A N S F E R E N C E T O A N O T H E R G E N U S O R S P E C I E S

Article54

54.1. When a subdivision of a genus is transferred to another genus or placed
under another generic name for the same genus without change of rank,the
epithetof its formerly correct name must be retained unless one of the following
obstacles exists:

(a) The resulting combination has been previously and validly published for a
subdivision of a genus based on a different type;

(b) Theepithetofan earlier legitimatename of the same rank is available (but
see Arts.13.1(d),58,59);

(c) Arts.21 or22 provide that another epithet be used.

Ex. 1. Saponaria sect.Vaccaria DC. when transferred toGypsophila becomesGypsophila sect.
Vaccaria (DC.) Godron.

Ex. 2. Primula sect.Dionysiopsis Pax(1909) when transferred to the genusDionysiabecomes
Dionysia sect.Dionysiopsis (Pax) Melchior(1943); the nameDionysia sect.Ariadne Wendelbo(1959),
based on the same type,is not to be used.

Article55

55.1. When a species is transferred to another genus or placed under another
generic name for the same genus without change of rank, theepithetof its

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formerly correct name must be retained unless one of the following obstacles
exists:

(a) The resulting binary name is a later homonym (Art.64) or a tautonym (Art.
23.4);

(b) Theepithet ofan earlier legitimate specificname is available (but see Arts.
13.1(d),58,59).

Ex. 1. Antirrhinum spurium L.(1753) when transferred to the genusLinaria must be calledLinaria
spuria (L.)Miller (1768).

Ex. 2. Spergula stricta Sw. (1799) when transferred to the genusArenaria must be calledArenaria
uliginosa Schleicher ex Schlechtendal (1808) because of the existence of the nameArenaria stricta
Michx. (1803), referring to a different species; but on further transfer to the genusMinuartia the
epithetstricta must be used and the species calledMinuartia stricta (Sw.) Hiern (1899).

Ex. 3. Conyza candida L.(1753) was illegitimately renamedConyza limonifolia Smith(1813) and
Inula limonifolia Boiss.(1843). However, the Linnaean epithet must be retained and the correct name
of the species, in the genusInula, isI. candida (L.) Cass.(1822).

Ex. 4. When transferringSerratula chamaepeuce L. (1753) to his new genusPtilostemon, Cassini
renamed the speciesP. muticus Cass.(1826,muticum). Lessing rightly reinstated the original specific
epithet, creating the combinationPtilostemon chamaepeuce (L.) Less.(1832).

Ex. 5. Spartium biflorum Desf. (1798) when transferred to the genusCytisus by Spach in 1849 could
not be calledC. biflorus, because this name had been previously and validly published for a different
species by LHéritier in 1791; the nameC. fontanesii given by Spach is therefore legitimate.

Ex. 6. Arum dracunculus L. (1753) when transferred to the genusDracunculus was renamedDracun-
culus vulgaris Schott (1832), as use of the Linnaean epithet would create a tautonym.

Ex. 7. Melissa calamintha L. (1753) when transferred to the genusThymus becomesT. calamintha
(L.) Scop. (1772); placed in the genusCalamintha it may not be calledC. calamintha (a tautonym) but
has been namedC. officinalis Moench (1794). However, whenC. officinalis is transferred to the genus
Satureja, the Linnaean epithet is again available and the name becomesS. calamintha (L.) Scheele
(1843).

Ex. 8. Cucubalus behen L.(1753) was legitimately renamedBehen vulgaris Moench(1794) to avoid
the tautonymBehen behen.If the species is transferred to the genusSilene, it may not retain its
original epithet because of the existence of aSilene behen L. (1753). Therefore, the substitute name
Silene cucubalus Wibel(1799) was created.However, the specific epithetvulgaris was still available
underSilene.It was rightly reinstated in the combinationSilene vulgaris (Moench) Garcke(1869).

55.2. On transferenceof a specific epithetunder anothergeneric name, the
resulting combination must be retained for the species to which thetype of the
basionym belongs, and attributed to the author who first published it, even
though it may havebeen applied erroneously to a different species(Art.7.10; but
see Arts.48.1and59.6).

Ex. 9. Pinus mertensiana Bong. was transferred to the genus Tsuga by Carrière, who, however, as is
evident from his description, erroneously applied the new combinationTsuga mertensiana to another
species ofTsuga, namelyT. heterophylla (Raf.) Sarg. The combinationTsuga mertensiana (Bong.)
Carrière must not be applied toT. heterophylla (Raf.) Sarg. but must be retained forPinus
mertensiana Bong. when that species is placed inTsuga; the citation in parentheses (under Art.49) of
the name of the original author, Bongard, indicates the type of thename.

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Union of taxa

Article56

56.1. When an infraspecific taxon is transferred without change of rank to
another genus or species, thefinal epithetof its formerly correct name must be
retained unless one of the following obstacles exists:

(a) The resulting ternary combination, witha different type, has been previously
and validly published for an infraspecific taxon ofany rank;

(b) Theepithetofan earlier legitimatename at the same rank is available (but see
Arts.13.1(d),58,59);

(c) Art.26 provides that another epithet be used.

Ex. 1. Helianthemum italicum var.micranthum Gren. & Godron (Fl. France 1: 171. 1847) when
transferred as a variety toH. penicillatum Thibaud ex Dunal retains its varietal epithet, becomingH.
penicillatum var.micranthum (Gren. & Godron) Grosser (in Engler, Pflanzenr. 14 (IV. 193): 115
1903).

56.2. On transferenceof aninfraspecific epithetunder anotherspecific name, the
resulting combination must be retained for the taxon to which thetype of the
basionym belongs, and attributed to the author who first published it, even
though it may havebeen applied erroneously to a different taxon (Art.7.10; but
seeArts.48.1and59.6).

S E C T I O N 3 . C H O I C E O F N A M E S W H E N T A X A O F T H E S A M E R A N K A R E

U N I T E D

Article57

57.1. When two or more taxa of the same rank are united, theearliest legitimate
name or (for taxa below the rank of genus)the finalepithetof theearliest
legitimatename is retained, unlessanotherepithet or a later name must be
accepted under the provisions of Arts.13.1(d),14,16.1,19.3,22.1,26.1,27,55.1,
58, or59.

Ex. 1. Schumann (in Engler & Prantl, Nat. Pflanzenfam. III, 6: 5. 1890), uniting the three genera
Sloanea L. (1753),Echinocarpus Blume (1825), andPhoenicosperma Miq. (1865), rightly adopted the
earliest of these three generic names,Sloanea L., for the resulting genus.

57.2. The author who first unites taxa bearing namesofequal priority must
choose one of them,unless an autonym is involved (see Art. 57.3). The name he
chooses is then treated as having priority.

Ex. 2. If the two generaDentaria L. (1 May1753) andCardamine L. (1 May1753) are united, the
resulting genus must be calledCardamine because that name was chosen by Crantz (Cl. Crucif.
Emend. 126. 1769), who was the first to unite the two genera.

Ex. 3. R. Brown (in Tuckey, Narr. Exp. Congo 484. 1818) appears to have been the first to unite
Waltheria americana L. (1 May1753) andW. indica L. (1 May1753). He adopted the nameW. indica
for the combined species, and this name is accordingly to be retained.

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Ex. 4. Baillon (Adansonia 3: 162.1863), when uniting for the first timeSclerocroton integerrimus
Hochst. ex Krauss (Flora 28: 85. 1845) andSclerocroton reticulatus Hochst. ex Krauss (Flora 28: 85.
1845), adopted the epithetintegerrimus in the name of the combined taxon. Consequently this epithet
is to be retained irrespective of the generic name (Sclerocroton,Stillingia,Excoecaria,Sapium)with
which it iscombined.

Ex. 5. Linnaeus in 1753 simultaneously published the namesVerbesina alba andV. prostrata. Later
(1771), he publishedEclipta erecta, a superfluous name becauseV. alba is cited in synonymy, andE.
prostrata, based onV. prostrata.The first author to unite these taxa wasRoxburgh (Fl. Ind. 3: 438.
1832), who did so under the nameEcliptaprostrata (L.)L., which therefore is to be used if these taxa
are united and placed in the genusEclipta.

Ex. 6. When the generaEntoloma (Fr.ex Rabenh.)P. Kummer (1871),Leptonia (Fr.)P. Kummer
(1871),Eccilia (Fr.)P. Kummer (1871),Nolonea (Fr.)P. Kummer (1871), andClaudopus Gillet
(1876) are united, one of the generic names simultaneously published by Kummer must be used for
the whole, as was done by Donk(Bull. Jard. Bot. Buitenzorg ser. 3, 18(1): 157. 1949) who selected
Entoloma. The nameRhodophyllus Quélet (1886), introduced to cover these combined genera, is
superfluous.

57.3. An autonym is treated as having priority over the name or names of the
same date and rank that established it.

Note 1. When the final epithet of an autonym is used in a new combination under the requirements of
Art. 57.3, the basionym of that combination is the name from which the autonym is derived.

Ex. 7. Heracleum sibiricum L. (1753) includesH. sibiricum subsp.lecokii (Godron & Gren.) Nyman
(1879) andH. sibiricum subsp.sibiricum (1879) automatically established at the same time. WhenH.
sibiricum is included inH. sphondylium L. (1753) as a subspecies, the correct name for the taxon isH.
sphondylium subsp.sibiricum (L.) Simonkai (1887), not subsp.lecokii.

Ex. 8. In the classification adopted by Rollins and Shaw,Lesquerella lasiocarpa (Hooker ex A.
Gray)S. Watson is composed of two subspecies, subsp.lasiocarpa (which includes the type of the
name of the species and is cited without an author) and subsp.berlandieri (A. Gray) Rollins &E.
Shaw. The latter subspecies is composed of two varieties. In this classification the correct name of the
variety which includes the type of subsp.berlandieri isL. lasiocarpa var.berlandieri (A. Gray) Payson
(1922), notL. lasiocarpa var.berlandieri (cited without an author)norL. lasiocarpa var.hispida (S.
Watson) Rollins &E. Shaw (1972), based onSynthlipsis berlandieri var.hispidaS. Watson (1882),
since publication of the latter name established the autonymSynthlipsis berlandieri A. Gray var.
berlandieri which, at varietal rank, is treated as having priority over var.hispida.

Recommendation57A

57A.1. Authors who have to choose between two generic names should note the following sugges-
tions:

(a) Of two names of the same date, to prefer that which was first accompanied by the description of a
species.

(b) Of two names of the same date, both accompanied by descriptions of species, to prefer that which,
when the author makes his choice, includes the larger number of species.

(c) In cases of equality from these various points of view, to select the more appropriate name.

Article58

58.1. When anon-fossil taxon of plants, algae excepted, and afossil(or subfos-
sil) taxon of the same rank are united, the correct name of thenon-fossil taxonis
treated as having priority (seePre.7).

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59	Pleomorphic fungi

Ex. 1. IfPlatycarya Siebold & Zucc. (1843), anon-fossil genus, andPetrophiloides Bowerbank
(1840), afossil genus, are united, the namePlatycarya is accepted for the combined genus, although
it is antedated byPetrophiloides.

Ex. 2. The generic nameMetasequoia Mild (1941) was based on the fossil type ofM. disticha (Heer)
Miki. After discovery of the non-fossil speciesM. glyptostroboides Hu & Cheng, conservation of
Metasequoia Hu & Cheng (1948) as based on the non-fossil type was approved. Otherwise, any new
generic name based onM. glyptostroboides would have had to be treated as having priority over
Metasequoia Miki.

S E CT I O N 4. N A M E S O F F U N G I W I T H A P L E O M O R P H I C L I F E C Y C L E

Article59

59.1. Inascomycetous andbasidiomycetous fungi (including Ustilaginales)
withmitotic asexual morphs (anamorphs) as well as a meiotic sexual morph
(teleomorph), the correct namecovering the holomorph (i.e., the species in all its
morphs) is – except forlichen-forming fungi – the earliest legitimate name
typified byan element representing the teleomorph, i.e. the morph characterized
bythe production of asci/ascospores, basidia/basidiospores, teliospores,
or other basidium-bearingorgans.

59.2. For abinary name to qualify as a name of a holomorph, not onlymust its
type specimen be teleomorphic, but also the protologue must include a diagnosis
or description ofthis morph(or be so phrased that thepossibility of reference to
the teleomorphcannot be excluded).

59.3. If these requirements are not fulfilled, the nameis that of a form-taxon and
is applicable only to the anamorph represented by its type, as described or
referred to in the protologue. The accepted taxonomic disposition of the type of
the name determines the application of the name, no matter whether the genus to
which a subordinate taxon is assigned by the author(s) is holomorphic or
anamorphic.

59.4. The priority of names of holomorphs at any rank is not affected by the
earlier publication of names of anamorphs judged to be correlated morphs of the
holomorph.

59.5. The provisions ofthis article shall not be construed as preventing the
publication and use ofbinary namesfor form-taxawhen it is thought necessary
or desirable to refer to anamorphs alone.

Note 1. When not already available, specific or infraspecific names for anamorphs may he proposed
at the time of publication of the name for the holomorphic fungus or later. The epithets may, if
desired, be identical, as long as they are not in homonymous combinations.

59.6. As long as there is direct and unambiguous evidence for the deliberate
introduction of a new morph judged by the author(s) to be correlated with the
morph typifying a purported basionym, and this evidence is strengthened by

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Change of rank

fulfilment of all requirements in Arts.32–45 forvalid publication of aname of a
new taxon, any indication such as comb. nov. or nom. nov. is regarded as a
formal error, and the name introduced is treated as that of a new taxon, and
attributed solelyto the author(s) thereof. When only the requirements forvalid
publication ofa new combination (Arts.33,34) have been fulfilled, the name is
accepted as such andbased, in accordance with Art.55, on thetype of the
declared or implicit basionym.

Ex. 1. The namePenicillium brefeldianum Dodge, based on teleomorphic and anamorphic material,
is a valid and legitimate name of a holomorph, in spite of the attribution of the species to a form-
genus. It is legitimately combined in a holomorphic genus asEupenicillium brefeldianum (Dodge)
Stolk & Scott.P. brefeldianum is not available for use in a restricted sense for the anamorph alone.

Ex. 2. The nameRavenelia cubensis Arthur &Johnston, based on a specimen bearing only uredinia
(an anamorph),is avalid andlegitimate name of an anamorph, in spite of the attribution ofthe
species to a holomorphicgenus. It is legitimately combined in a form-genus asUredo cubensis
(Arthur & Johnston)Cummins.R. cubensis is not available for use inclusive of the teleomorph.

Ex. 3. Mycosphaerella aleuritidiswaspublished as(Miyake) Oucomb. nov., syn.Cercospora
aleuritidis Miyakebut with a Latin diagnosis of theteleomorph. The indication comb. nov. is taken
as a formal error, andM. aleuritidis Ouis accepted as a validly publishednew specificname for the
holomorph, typified by the teleomorphicmaterial describedby Ou.

Ex. 4. Corticium microsclerotiumwas published in1939 as (Matz) Weber, comb. nov., syn.Rhizoc-
tonia microsclerotia Matz with a description, only in English, of theteleomorph. Because of Art.36,
this maynot beconsidered as thevalid publication of the name of a newspecies, and soC.
microsclerotium (Matz) Weber must be considered a validly published and legitimate newcombina-
tion based on thespecimen of the anamorph that typifies its basionym.C. microsclerotium Weber, as
published in1951 with aLatin description and a teleomorphictype, is an illegitimate later homonym
of the combinationC. microsclerotium (Matz) Weber (1939), typified by an anamorph.

Ex. 5. Hypomyces chrysospermus Tul. (Ann. Sci. Nat. Bot. ser. 4, 13: 16. 1860), presented as the
name of a holomorph without the indication comb. nov. but with explicit reference toMucor
chrysospermus (Bull.) Bull. andSepedonium chrysospermum (Bull.) Fr., which are names of its
anamorph, is not to be considered as a new combination but as the name of a newly described species,
with a teleomorphic type.

Recommendation59A

59A.1 When a new morph of a fungus is described, it should be published either as a new taxon (e.g.,
gen. nov., sp. nov., var. nov.) whose name has a teleomorphic type, or as a new anamorph (anam.
nov.) whose name has an anamorphic type.

59A.2 When in naming a new morph of a fungus the epithet of the name of a different, earlier
described morph of the same fungus is used, the new name should be designated as the name of a new
taxon or anamorph, as the case may be, but not as a new combination based on the earlier name.

S E C T I O N 5 . C H O I C E O F N A M E S W H E N T H E R A N K O F A T A X O N I S C H A N G E D

Article60

60.1. In no case does a name have priority outside its own rank.

Ex. 1. Campanula sect.Campanopsis R. Br. (Prodr. 561. 1810) as a genus is calledWahlenbergia

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61–62

Rejection

Roth(1821), a name conserved against the taxonomic synonymCervicina Delile(1813), and not
Campanopsis (R. Br.) Kuntze(1891).

Ex. 2. Magnolia virginiana var.foetida L.(1753) when raised to specific rank is calledMagnolia
grandiflora L.(1759), notM. foetida (L.) Sarg.(1889).

Ex. 3. Lythrum intermedium Ledeb.(1822) when treated as a variety ofLythrum salicaria L.(1753)
has been calledL. salicaria var.glabrum Ledeb. (Fl. Ross. 2: 127. 1843),and hence may notbe called
L. salicaria var.intermedium (Ledeb.) Koehne (Bot. Jahrb. Syst. 1: 327. 1881).

Article61

61.1. When a taxonat the rankof familyor below is changedto another such
rank,the correct name is the earliest legitimate one available in the new rank.

Recommendation61A

61A.1. When afamily or subdivision of afamily is changed in rank and no earlier legitimate name is
available in the new rank, the stem of the nameshould be retained and only the termination (-aceae,
-oideae,-eae,-inae)altered, unless the resulting namewould be a later homonym.

Ex. 1. The subtribeDrypetinae Pax (1890) (Euphorbiaceae) when raised to the rank of tribe was
namedDrypeteae (Pax) Hurusawa (1954); the subtribeAntidesmatinae Pax (1890) (Euphorbiaceae)
when raised to the rank of subfamily was namedAntidesmatoideae (Pax) Hurusawa (1954).

61A.2. When a section or a subgenus is raised in rank to a genus, or the inverse change occurs, the
original name or epithet should be retained unlessthe resulting name would be contrary to this Code.

61A.3. When an infraspecific taxon is raised in rank to a species, or the inverse change occurs, the
original epithet should be retained unless the resulting combinationwould be contrary to this Code.

61A.4. When an infraspecific taxon is changed in rank within the species, the original epithet should
be retained unless the resulting combinationwould be contrary to this Code.

S E C T I O N 6. R E J E C T I O N O F N A M E S A N D E P I T H E T S

Article62

62.1. Anepithet ora legitimate name must not be rejected merely because it is
inappropriate or disagreeable, or because another is preferable or better known
or because it has lost its original meaning, or (in pleomorphic fungi with names
governed by Art. 59) because the generic name does not accord with the morph
represented by its type.

Ex. 1. The following changes are contrary to the rule:Staphylea toStaphylis,Tamus toThamnos
Thamnus, orTamnus,Mentha toMinthe,Tillaea toTillia,Vincetoxicum toAlexitoxicum; and
Orobanche rapum toO. sarothamnophyta,O. columbariae toO. columbarihaerens,O. artemisiae toO.
artemisiepiphyta. All these modifications are to be rejected.

Ex. 2. Ardisia quinquegona Blume (1825) is not to be changed toA. pentagona A. DC. (1834)
although the specific epithetquinquegona is a hybrid word (Latin and Greek) (see Rec.23B.1(c))

Ex. 3. The nameScillaperuviana L. is not to be rejected merely because the species does not grow in
Peru.

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Rejection

Ex. 4. The namePetrosimonia oppositifolia (Pallas) Litv., based onPolycnemum oppositifolium
Pallas, is not to be rejected merely because the species has leaves only partly opposite, and partly
alternate, although there is another closely related species,Petrosimonia brachiata (Pallas) Bunge,
having all its leaves opposite.

Ex. 5. RichardiaL. is not to be changed toRichardsonia, as was done by Kunth, although the name
was originally dedicated to the British botanist, Richardson.

62.2. The names of species and of subdivisions of genera assigned to genera
whose names are conserved later homonyms, and which had earlier been as-
signed to the genera under the rejected homonymic names, are legitimate under
the conserved names without change of authorship or date if there is no other
obstacle under the rules.

Ex. 6. Alpinia languasJ. F. Gmelin (1791) andAlpinia galanga (L.) Willd. (1797) are to be accepted
althoughAlpinia L. (1753), to which they were assigned by their authors, is rejected and the genus in
which they are now placed isAlpinia Roxb. (1810), nom. cons.

Article63

63.1. A name is illegitimate and is to be rejected if it was nomenclaturally
superfluous when published, i.e. if the taxon to which it was applied, as circum-
scribed by its author, included the type of a name which ought to have been
adopted,orwhoseepithetought to have been adopted, under the rules(but see
Art. 63.3).

Ex. 1. The generic nameCainito Adanson(1763) is illegitimate because it was a superfluous name for
Chrysophyllum L.(1753)which Adanson cited as a synonym.

Ex. 2. Chrysophyllum sericeum Salisb.(1796) is illegitimate, being a superfluous name for
C. cainito L. (1753), which Salisbury cited as a synonym.

Ex. 3. On the other hand,Salix myrsinifolia Salisb.(1796) is legitimate, being explicitly based upon
S. myrsinitesofHoffmann (Hist. Salic. Ill.71. 1787), a misapplication of the nameS. myrsinites L.

Ex. 4. Picea excelsa Link is illegitimate because it is based onPinus excelsa Lam.(1778), a
superfluous name forPinus abies L.(1753). UnderPicea the proper name isPicea abies (L.)H
Karsten.

Ex. 5. On the other hand,Cucubalus latifoliusMiller andC. angustifoliusMiller (1768) are not
illegitimate names, although these species are now united with the species previously namedC. behen
L. (1753):C. latifoliusMiller andC. angustifoliusMiller as circumscribed by Miller did not include
the type ofC. behen L., which name he adopted for another independent species.

63.2. The inclusion of a type (see Art.7) is here understood to mean the citation
ofthe type specimen, the citation ofan illustration ofthe type specimen, the
citation of the type of a name, or the citation of the name itself unless the type is at
the same time excluded either explicitly or by implication.

Ex. 6. Explicit exclusion of type: When publishing the nameGalium tricornutum, Dandy (Watsonia
4: 47. 1957) citedG. tricorne Stokes (1787) pro parte as a synonym, but explicitly excluded the type of
the latter name.

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64	Rejection

Ex. 7. Exclusion of type by implication:Cedrus Duhamel(1755) is a legitimate name even though
Juniperus L. was cited as a synonym; only some of the species ofJuniperus L. were included inCedrus
and the differences between the two genera are discussed,Juniperus (including its type) being
recognized in the same work as an independent genus.

Ex. 8. Tmesipteris elongata Dangeard (Botaniste 2: 213. 1890–1891) was published as a new species
butPsilotum truncatum R. Br. was cited as a synonym. However, on the following page (214),T.
truncata (R. Br.) Desv. is recognized as a different species and on p. 216 the two are distinguished in a
key, thus showing that the meaning of the cited synonym was eitherP. truncatum R. Br. pro parte or
P. truncatum auct. non R. Br.

Ex. 9. Solanum torvumSw. (Prodr. 47. 1788) was published with a new diagnosis butS. indicum
(1753) was cited as a synonym. In accord with the practice in his Prodromus, Swartz indicated where
the species was to be inserted in the latest edition [14, Murray] of the Systema Vegetabilium.S. torvum
was to be inserted between species 26(S. insanum) and 27 (S. ferox); the number ofS. indicum in
edition of the Systema is 32.S. torvum is thus a legitimate name; the type ofS. indicum is excluded by
implication.

63.3. A namethat was nomenclaturally superfluous when published is not
illegitimate if its basionym is legitimate, or if it is based on the stem of a legitimate
generic name. When published it is incorrect, but it may become correct later.

Ex. 10. Chloris radiata (L.) Sw.(1788), based onAgrostis radiata L.(1759), was nomenclaturally
superfluous when published, since Swartz also citedAndropogon fasciculatus L.(1753) as a synonym
It is, however, the correct name in the genusChloris forAgrostis radiata whenAndropogon
fasciculatus is treated as a different species, as was done by Hackel (in A.DC. & C. DC., Monogr.
Phan. 6: 177. 1889).

Ex. 11. The generic nameHordelymus (Jessen)Jessen (1885), based on the legitimateHordeum subg.
Hordelymus Jessen (Deutschl. Gräser 202. 1863), was superfluous when published because its type,
Elymus europaeus L., is also the type ofCuviera Koeler(1802).Cuviera Koeler has since been rejected
in favour of its later homonymCuviera DC., andHordelymus (Jessen)Jessen can now be used as a
correct name for the segregate genus containingElymus europaeus L.

63.4. A statement of parentage accompanying the publication of a name for a
hybrid cannot make the name superfluous.

Ex. 12. The namePolypodium × shivasiae Rothm. (1962) was proposed for hybrids betweenP.
australe andP. vulgare subsp.prionodes, while at the same time the author acceptedP. × font-queri
Rothm. (1936) for hybrids betweenP. australe andP. vulgare subsp.vulgare. Under Art.H.4.1,P
× shivasiae is a synonym ofP. × font-queri; nevertheless, it is not a superfluous name.

Article64

64.1. A name,unless conserved(Art.14) or sanctioned under Art.13.1(d), is
illegitimate if it is a later homonym, that is, if it is spelled exactly like a name
based on a different typethat was previously and validly published for a taxon of
the same rank.

Note 1. Even if the earlier homonym is illegitimate, or is generally treated as a synonym on
taxonomic grounds, the later homonym must be rejected.

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Rejection

Ex. 1. The nameTapeinanthus Boiss. ex Bentham (1848), given to a genus ofLabiatae, is a later
homonym ofTapeinanthus Herbert (1837), a name previously and validly published for a genus of
Amaryllidaceae; Tapeinanthus Boiss. ex Bentham is therefore rejected, as was done by T. Durand
(1888), who renamed itThuspeinanta.

Ex. 2. The generic nameAmblyanthera Müll. Arg. (1860) is a later homonym of the validly published
generic nameAmblyanthera Blume (1849) and is therefore rejected, althoughAmblyanthera Blume is
now considered to be a synonym ofOsbeckia L. (1753).

Ex. 3. The nameTorreya Arn. (1838) is anomen conservandum and is therefore not to be rejected
because of the existence of the earlier homonymTorreya Raf. (1818).

Ex. 4. Astragalus rhizanthus Boiss.(1843) is a later homonym of the validly published name
Astragalus rhizanthus Royle(1835) and it is therefore rejected, as was done by Boissierin1849, who
renamed itA. cariensis.

64.2. Whentwo or more generic,specific, orinfraspecific namesbased on
different types are so similar that they are likely to be confused*, because they are
applied to related taxa or for any other reason, they are to be treated as
homonyms.

Ex. 5. Names treated ashomonyms:AstrostemmaBentham andAsterostemmaDecne.;Pleuripeta-
lumHooker andPleuropetalumT. Durand;EschweileraDC. andEschweileriaBoerl.;Skytanthus
Meyen andScytanthusHooker.

Ex. 6. The three generic namesBradlea Adanson,Bradleja Banks ex Gaertner, andBraddleya Vell.,
all commemorating Richard Bradley, must be treated ashomonyms because only one can be used
without serious risk of confusion.

Ex. 7. Kadalia Raf. andKadali Adanson (bothMelastomataceae)are treated as homonyms (Taxon
15: 287. 1966);Acanthoica Lohmann andAcanthoeca W. Ellis (bothflagellates) are sufficiently alike
to be considered homonyms (Taxon 22: 313. 1973); SolanumsaltienseS. L. Moore andS.saltense
(Bitter) C. Morton should be treated ashomonyms (Taxon 22: 153. 1973).

Ex. 8. Epithetsso similar that they are likely to be confused if combined under the same generic or
specific name:chinensis andsinensis; ceylanica andzeylanica; napaulensis,nepalensis, andnipalensis;
polyanthemos andpolyanthemus; macrostachys andmacrostachyus; heteropus andheteropodus;
poikilantha andpoikilanthes; pteroides andpteroideus; trinervis andtrinervius; macrocarpon and
macrocarpum; trachycaulum andtrachycaulon.

Ex. 9. Names not likely to be confused:RubiaL. andRubusL.;MonochaeteDoell andMonochae-
tum(DC.) Naudin;PeponiaGrev. andPeponiumEngler;Iria(Pers.) Hedwig andIrisL.;Desmosta-
chysMiers andDesmostachya(Stapf) Stapf;SymphyostemonMiers andSymphostemonHiern;
GerrardinaOliver andGerardiinaEngler;DurvillaeaBory andUrvilleaKunth;PeltophorusDesv.

(Gramineae) andPeltophorum(Vogel) Bentham (Leguminosae);Senecio napaeifolius (DC.) Schultz-
Bip. andS. napifolius MacOwan(the epithets being derived respectively fromNapaea andNapus);

Lysimachia hemsleyanaOliver andL. hemsleyiFranchet (see, however, Rec.23A.2);Euphorbia peplis
L. andE. peplus L.

* When it is doubtful whether names are sufficiently alike to be confused,a request for a decision
may besubmitted to the General Committee(seeDivision III)which will refer it for examination to
the committee or committees for the appropriate taxonomic group or groups. A recommendation
may then be put forward to an International Botanical Congress, and, if ratified, will become a
binding decision.(This provision was adopted in 1981 and none of the examples are yet in the
nature of a binding decision.)

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65	Rejection

Ex. 10. Acanthococcus Lagerh. (an alga) andAcanthococos Barb. Rodr. (a palm) are not likely to be
confused and should not be treated as homonyms (Taxon 18: 735. 1969).

Ex. 11. Names conserved against earliernames treated as homonyms (see App.III):Lyngbya
Gomont (vs.Lyngbyea Sommerf.);Columellia Ruiz & Pavón (vs.Columella Lour.), both commemo-
rating Columella, the Roman writer on agriculture;Cephalotus Labill. (vs.Cephalotos Adanson);
Simarouba Aublet (vs.Simaruba Boehmer).

64.3. The names of two subdivisions of the same genus, or of two infraspecific
taxa within the same species, even if they are of different rank, are treated as
homonyms if they have the same epithet and are not based on the same type. The
same epithet may be used for subdivisions of different genera, and for infraspe-
cific taxa within different species.

Ex. 12. Verbascumsect.Aulacosperma Murb. (1933) is allowed, although there was alreadyaCelsia
sect.Aulacospermae Murb. (1926). This, however, is not an example to be followed, since it is
contrary to Rec.21B.2.

Ex. 13. The namesAndropogon sorghum subsp.halepensis (L.) Hackel andA. sorghum var.halepen-
sis (L.) Hackel (in A. DC & C.DC., Monogr. Phan. 6: 502. 1889) are legitimate, since both have the
same type and the epithet may be repeated under Rec.26A.1.

Ex. 14. Anagallis arvensis var.caerulea (L.) Gouan (Fl. Monsp. 30. 1765), based onA. caerulea L
(1759), makes illegitimate the combinationA. arvensis subsp.caerulea Hartman (Sv. Norsk Exc.-Fl.
32. 1846), based on the later homonymA. caerulea Schreber(1771).

64.4. Whentwo or more homonyms have equal priority, the firstof them that is
adopted by an author whosimultaneously rejects the other(s)is treated as having
priority. Likewise, if an author substitutes other names forallbut one of these
homonyms, the homonym for the taxon that is not renamed is treated as having
priority.

Ex. 15. Linnaeus simultaneously published bothMimosa 10cinerea (Sp. Pl. 517. 1753) andMimosa
25cinerea (Sp. Pl. 520.1753).In 1759, he renamed species 10Mimosa cineraria and retained the
nameMimosa cinerea for species 25;Mimosa cinerea is thusa legitimate name for species 25.

Ex. 16. Rouy & Foucaud (Fl. France 2: 30. 1895) published the nameErysimum hieraciifolium var.
longisiliquum, withtwo different types,for two different taxa under different subspecies. Only one of
these names can be maintained.

Article65

65.1. Consideration of homonymy does not extend to the names of taxa not
treated as plants, except as stated below:

(a) Later homonyms of the names of taxa once treated as plants are illegitimate,
even though the taxa have been reassigned to a different group of organisms
to which this Code does not apply.

(b) A name originally published for a taxon other than a plant, even if validly
      published under Arts.32–45 of this Code, is illegitimate if it becomes a
      homonym of a plant name when the taxon to which it applies is first treated
      as a plant (see also Art.45.4).

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Rejection

66–69

Note 1. The International Code of Nomenclature of Bacteria provides that a bacterial name is
illegitimate if it is a later homonym of a name of a taxon of bacteria, fungi, algae, protozoa, or viruses.

Article66

66.1. A name of a subdivision of a genus is illegitimate and is to be rejected if it
was published in contravention of Arts.51,54,57,58, or60, i.e. if its author did
not adopt the epithet of the earliest legitimate name available for the taxon with
its particular circumscription, position, and rank(but see Art. 63.3).

Note 1. Illegitimatenames are not to be taken into consideration for purposes of priority (see Art.
45.3) except in the rejection of a later homonym (Art.64).

Note 2. An epithet originally published as part of an illegitimate name may be adopted later for the
same taxon, but in another combination (see Art.72).

Article67

67.1. A specific or infraspecificname is illegitimate and is to be rejected if it was
published in contravention of Arts.51,53,55,56, or60, i.e. if its author did not
adopt thefinal epithetof theearliest legitimatename available for the taxon with
its particular circumscription, position, and rank(but see Art.(but see Art. 63.3).

Note 1. Illegitimatenames are not to be taken into consideration for purposes of priority (see Art.
45.3) except in the rejection of a later homonym (Art.64).

Note 2. Afinal epithetoriginally published as part of an illegitimate name may be adopted later for
the same taxon, but in another combination (see Art.72).

Article68

68.1. A specificname is not illegitimate merely becauseitsepithet was originally
combined with an illegitimate generic name, but is to be taken into consideration
for purposes of priority if the epithet and the corresponding combination are in
other respects in accordance with the rules.

Ex. 1. Agathophyllum A. L. Juss.(1789) is an illegitimate generic name, being a superfluous
substitute forRavensara Sonn.(1782). Nevertheless the validly published nameAgathophyllum
neesianum Blume(1851) is legitimate. Because Meisner citedAgathophyllum neesianum as a synonym
ofMespilodaphne mauritiana Meisner(1864) but did not adopt its epithet,M. mauritiana is a
superfluous name and hence illegitimate.

68.2. An infraspecificname may be legitimate even ifits finalepithetwas
originallyplaced under an illegitimate name.

Article69

69.1. A namemay beruled as rejected if it has been widely and persistently used
for a taxonor taxa not including its type.A name thus rejected, or its basionym if

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Rejection

it has one, is placed on a list ofnomina rejicienda. Along with the listed names, all
combinations based on them are similarly rejected, and none is to be used.

69.2. Thelist ofrejected names will remain permanently open for additions and
changes. Any proposal of an additional name must be accompanied by a detailed
statement of the cases both for and against itsrejection. Suchproposals mustbe
submittedto the General Committee (seeDivision III), which will refer them for
examination to thecommittees for the various taxonomic groups (see also Art.
15 and Rec.15A).

Article70

70.1. [Article 70, dealing with discordant elements, was deleted by the Leningrad
Congress, 1975.]

Article71

71.1. [Article 71, dealing with monstrosities, was deleted by the Leningrad Congress,
1975.]

Article72

72.1. A name rejected under Arts.63–67 or69 is replaced by the namethat has
priority (Art.11) in the rank concerned. If none exists in any rank a new name

must be chosen:(a) the taxon may be treated as new andanother name
publishedfor it, or(b)if the illegitimate name is a later homonym, an avowed

substitute(nomen novum) based on the same type as the rejected name may be
published for it. If a name is available in another rank, one of the above
alternatives may be chosen, or(c) a new combination, based on the name in the
other rank, may be published.

72.2. Similar action is to be takenif transfer of an epithetof a legitimate name
would result in a combination that cannot be validly published under Arts.21.3
or23.4.

Ex. 1. Linum radiola L. (1753) when transferred to the genusRadiola may not benamedRadiola
radiola (L.) H. Karsten (1882), as that combination isinvalid (see Arts.23.4 and32.1(b)). The next
oldest name,L. multiflorum Lam. (1779), is illegitimate,being a superfluous name forL. radiola L.
UnderRadiola, the specieshas been giventhe legitimatenameR. linoides Roth (1788).

Note 1. When a new epithet is required, an author may adopt an epithet previously given to the taxon
in an illegitimate name if there is no obstacle to its employment in the new position or sense; the
resultant combination is treated asthe name of anewtaxon or as a nomen novum, as the case may be.

Ex. 2. The nameTalinum polyandrum Hooker (1855) is illegitimate, being a later homonym ofT.
polyandrum Ruiz & Pavón (1798). When Bentham, in1863, transferredT. polyandrum Hooker to
Calandrinia, he called itCalandrinia polyandra.Thisname is treated ashaving priority from 1863,
and should becited asCalandrinia polyandra Bentham, notC. polyandra (Hooker) Bentham.

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Rejection

Ex. 3. Cenomyce ecmocyna Achar. (1810) is a superfluous name forLichen gracilis L. (1753), and so
isScyphophora ecmocyna Gray (1821), the type ofL. gracilis still being included. However, when
proposing the combinationCladonia ecmocyna, Leighton (1866) explicitly excluded that type and
thereby published a new, legitimate name,Cladonia ecmocyna Leighton.

Recommendation72A

72A.1. Authors should avoid adoption ofthe epithet of an illegitimatename previously published
for the same taxon.

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73	Orthography

C H A P T E R V I . O R T H O G R A P H Y O F N A M E S A N D E P I T H E T S

A N D G E N D E R O F G E N E R I C N A M E S

S E C T I O N 1. O R T H O G R A P H Y O F N A M E S A N D E P I T H E T S

Article73

73.1. The original spelling of a name or epithet is to be retained, except for the
correction of typographic or orthographic errors (but see Art.32.5).

Ex. 1. Retention of original spelling: The generic namesMesembryanthemum L. (1753) andAmaran-
thus L. (1753) were deliberately so spelled by Linnaeus and the spelling is not to be altered to
Mesembrianthemum andAmarantus respectively, although these latter forms are philologically
preferable (see Bull. Misc. Inform. 1928: 113, 287).–Phoradendron Nutt. is not to be altered to
Phoradendrum.–Triaspis mozambica Adr. Juss. is not to be altered toT. mossambica, as in Engler
(Pflanzenw. Ost-Afrikas C: 232. 1895).–Alyxia ceylanica Wight is not to be altered toA. zeylanica, as
in Trimen(Handb. Fl. Ceyl. 3: 127. 1895).–Fagus sylvatica L. is not to be altered toF. silvatica. The
classical spellingsilvatica is recommended for adoption in the case of a new name (Rec. 73E), but the
mediaeval spellingsylvatica is not treated as an orthographic error.–Scirpus cespitosus L. is not to be
altered toS. caespitosus.

Ex. 2. Typographic errors: Globba brachycarpa Baker(1890) andHetaeria alba Ridley(1896) are
typographic errors forGlobba trachycarpa Baker andHetaeria alta Ridley respectively (see J. Bot. 59:
349. 1921). –Thevetia nereifolia Adr. Juss. ex Steudel is an obvious typographic error forT. neriifolia.

Ex. 3. Orthographic error:Gluta benghas L.(1771), being an orthographic error forG. renghas,
should be cited asG. renghas L., as has been done by Engler (in A.DC. & C. DC., Monogr. Phan. 4:
225. 1883); the vernacular name used as a specific epithet by Linnaeus is Renghas, not Benghas.

Note 1. Art.14.10 provides for the conservation of an altered spelling of a generic name.

Ex. 4. Bougainvillea (see Appendix III, Spermatophyta, no. 2350).

73.2. The words original spelling in this Article mean the spelling employed
when the name was validly published. They do not refer to the use of an initial
capital or small letter, this being a matter of typography (see Art.21.2, Rec. 73F).

73.3. The liberty of correcting a name is to be used with reserve, especially if the
change affects the first syllable and, above all, the first letter of the name.

Ex. 5. The spelling of the generic nameLespedeza is not to be altered, although it commemorates
Vicente Manuel de Céspedes (see Rhodora 36: 130-132, 390-392. 1934).

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Orthography

73.4. The lettersw andy, foreign to classical Latin, andk, rare in that language,
are permissible in Latin plant names.

73.5. When a name or epithethas been publishedin a work wherethe lettersu,v
ori,j areused interchangeably or in any other way incompatible with modern
practices (one of those letters is not used or only in capitals), those letters should
be transcribed in conformity with modern botanical usage.

Ex. 6. UffenbachiaFabr.,notVffenbachia;Taraxacum Zinn,notTaraxacvm;CurculigoGaertner,
notCvrcvligo.

Ex. 7. Geastrvm hygrometricvm Pers. andVredo pvstvlata Pers. (1801) should be written respectively
Geastrum hygrometricum andUredo pustulata.

Ex. 8. Bromus iaponicus Thunb. (1784) should be writtenBromus japonicus.

73.6. Diacritical signs are not used in Latin plant names. In names (either new or
old) drawn from words in which such signs appear, the signs are to be suppressed
with the necessary transcription of the letters so modified; for exampleä,ö,ü
become respectivelyae,oe,ue; é,è,ê becomee, or sometimesae; ñ becomesn; ø
becomesoe; å becomesao; the diaeresis, however, is permissible.

Note 2. The diaeresis should be used where required in works in which diphthongs are not represen-
ted by special type, e.g.Cephaëlis, notCephaelis, in works in which there isArisaema, notArisæma.

73.7. When changes made in orthography by earlier authors who adopt person-
al, geographic, or vernacular names in nomenclature are intentional latiniza-
tions, they are to be preserved, except for terminations covered by Art. 73.10.

Ex. 9. Valantia L. (1753),Gleditsia L. (1753), andClutia L. (1753), commemorating Vaillant,
Gleditsch, and Cluyt respectively, are not to be altered toVaillantia,Gleditschia, andCluytia;
Linnaeus latinized the names of these botanists deliberately as Valantius, Gleditsius, and Clutius.

Ex. 10. Zygophyllum billardierii DC. was named for J. J. H. de Labillardière (de la Billardière). The
intended latinization is Billardierius (in nominative), but the change in the termination is not
acceptable under Art. 73.10 and the name is correctly spelledZ. billardierei DC.

73.8. The use of an incorrect compounding form in an epithet is treated as an
orthographic error to be corrected (see Rec.73G).

Ex. 11. Pereskia opuntiaeflora DC. is to be cited asP. opuntiiflora DC.

Ex. 12. Cacalia napeaefolia DC. andSenecio napeaefolius (DC.) Schultz-Bip. are to be cited as
Cacalia napaeifolia DC andSenecio napaeifolius (DC.) Schultz-Bip. respectively; the specific epithet
refers to the resemblance of the leaves to those of the genusNapaea (notNapea), and the substitute
(connecting) vowel-i should have been used instead of the genitive singular inflection-ae.

73.9. The use of a hyphen after a compounding form in an epithet is treated as an
orthographic error to be corrected.

Ex. 13. Acer pseudoplatanus L., notA. pseudo-platanus; Ficus neoëbudarum Summerh., notF.
neo-ebudarum; Lycoperdon atropurpureum Vitt., notL. atro-purpureum; Croton ciliatoglandulifer

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73	Orthography

Ortega, notC. ciliato-glandulifer; Scirpus sect.Pseudoëriophorum Jurtzer, notS. sect.Pseudo-
eriophorum.

Note3. Art. 73.9 refers only to epithets (in combinations), not to names of genera or taxa in higher
ranks; a generic name published with a hyphen can be changed only by conservation.

Ex. 14. Pseudo-salvinia Piton (1940).

Note4. A hyphen ispermitted in an epithet after a word which could stand independently (not a
compounding form)(see Art.23.1).

Ex. 15. Aster novae-angliae L.,Coix lacryma-jobi L.,Peperomia san-felipensis J. D. Smith,Arctosta-
phylos uva-ursi (L.) Sprengel,Veronica anagallis-aquatica L. (Art.23.3).

73.10. The wrong use of the terminations, for example-i,-ii,-ae,-iae,-anus, and
-ianus, mentioned in Rec. 73C.1 is treated as an orthographic error to be
corrected (see also Art.32.5).

Ex. 16. Rosa pissarti Carrière (Rev. Hort. 1880: 314) is a typographic error forR. pissardi (see Rev.
Hort. 1881: 190), which in its turn is treated as an orthographic error forR. pissardii (see Rec.
73C.l(b)).

Recommendation73A

73A.1. When a new name or epithet is to be derived from Greek, the transliteration to Latin should
conform to classical usage.

73A.2. Thespiritus asper should be transcribed in Latin as the letterh.

Recommendation73B

73B.1. When a new name for a genus, subgenus, or section is taken from the name of a person, it
should be formed as follows:

(a) When the name of the person ends in a vowel, the letter-a is added (thusOttoa after Otto;Sloanea
after Sloane), except when the name ends in-a, when-ea is added (e.g.Collaea after Colla), or in
-ea (asCorrea), when no letter is added.

(b) When the name of the person ends in a consonant, the letters-ia are added, except when the name
ends in-er, when-a is added (e.g.Kernera after Kerner). In latinized names ending in-us, this
termination is dropped before adding the suffix (Dillenia after Dillenius).

(c) The syllables not modified by these endings retain their original spelling, unless they contain
letters foreign to Latin plant names or diacritical signs (see Art. 73.6).

Note 1. Names may be accompanied by a prefix or a suffix, or be modified by anagram or
abbreviation. In these cases they count as different words from the original name.

Ex. 1. Durvillaea andUrvillea; Lapeirousia andPeyrousea; Englera,Englerastrum, andEnglerella;
Bouchea andUbochea; Gerardia andGraderia; Martia andMartiusia.

Recommendation73C

73C.1. Modern personal names may begiven Latin terminations and used to form specific and
infraspecific epithetsasfollows:

(a) If the personal name ends in a vowel or-er, substantive epithets are formed by adding the genitive
      inflection appropriate to the gender and number of the person(s) honoured (e.g.,scopoli-i for
     Scopoli (m),fedschenko-i forFedtschenko (m),glaziou-i for Glaziou (m),lace-ae for Lace (f),
     hooker-orum for the Hookers), except when the name ends in-a, in which case adding-e (singular)
      or-rum (plural) is appropriate (e.g.triana-e for Triana (m)).

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Orthography

(b) If the personal name ends in a consonant (except-er), substantive epithets are formed by adding
     -i- (stem augmentation) plus the genitive inflection appropriate to the gender and number of the
      person(s) honoured (e.g.lecard-ii for Lecard (m),wilson-iae for Wilson (f),verlot-iorum for the
      Verlot brothers,braun-iarum for the Braun sisters).

(c) If the personal name ends in a vowel, adjectival epithets are formed by adding-an- plus the
      nominative singular inflection appropriate to the gender of the generic name (e.g.,Cyperus heyne-
     anus for Heyne,Vanda lindley-ana for Lindley,Aspidium bertero-anum for Bertero), except when
      the personal name ends in-ain which case-n- plus the appropriate inflection is added (e.g.
     balansa-nus (m),balansa-na (f), andbalansa-num (n) for Balansa).

(d) If the personal name ends in a consonant, adjectival epithets are formed by adding-i- (stem
      augmentation) plus-an- (stem of adjectival suffix) plus the nominative singular inflection
      appropriate to the gender of the generic name (e.g.Rosa webb-iana for Webb,Desmodium griffith-
     ianum for Griffith,Verbena hassler-iana for Hassler).

Note 1. The hyphens inthe aboveexamples are used only to set off the total appropriate termination.

73C.2. Personal names already in Greek or Latin,or possessing a well-established latinized form,
should be given their appropriate Latin genitive to form substantive epithets (e.g.alexandri from
Alexanderor Alexandre,augusti from Augustusor August or Auguste,linnaei from Linnaeus,martii
from Martius,beatricis from Beatrixor Béatrice,hectoris from Hector). (However, modern personal
names are subject to the provisions of Art. 73.10.) Treating modern names as if they were in Third
Declension should be avoided (e.g.munronis from Munro,richardsonis from Richardson).

73C.3. In forming new epithets based on personal names the original spelling of the personal name
should not be modified unless it contains letters foreign to Latin plant names or diacritical signs (see
Art. 73.6).

73C.4. Prefixes and particles ought to be treated as follows:

(a) The Scottish patronymic prefix Mac, Mc or M, meaning son of, should be spelled mac and
united with the rest of the name, e.g.macfadyenii after Macfadyen,macgillivrayi after MacGilli-
vray,macnabii after McNab,mackenii after MKen.

(b) The Irish patronymic prefix O should be united with the rest of the name or omitted, e.g.
obrienii,brienianus after OBrien,okellyi after OKelly.

(c) A prefix consisting of an article, e.g. le, la, l, les, el, il, lo, or containing an article e.g. du, de la, des,
del, della, should be united to the name, e.g.leclercii after Le Clerc,dubuyssonii after DuBuysson,
lafarinae after La Farina,logatoi after Lo Gato.

(d) A prefix to a surname indicating ennoblement or canonization should be omitted, e.g.candollei
      after de Candolle,jussieui after de Jussieu,hilairei after Saint-Hilaire,remyi after St. Rémy; in
      geographical epithets, however, St. is rendered assanctus (m) orsancta (f), e.g.sancti-johannis,
      of St. John,sanctae-helenae, of St. Helena.

(e) A German or Dutch prefix when it is normally treated as part of the family name, as often
      happens outside its country of origin, e.g. in the United States, may be included in the epithet, e.g.
     vonhausenii after Vonhausen,vanderhoekii after Vanderhoek,vanbruntiae after Mrs. Van Brunt,
      but should otherwise be omitted, e.g.iheringii after von Ihering,martii after von Martius,steenisii
      after van Steenis,strassenii after zu Strassen,vechtii after van der Vecht.

Recommendation73D

73D.1. An epithet derived from a geographical name is preferably an adjective and usually takes the
termination-ensis,-(a)nus,-inus, or-icus.

Ex. 1. Rubus quebecensis (from Quebec),Ostrya virginiana (from Virginia),Eryngium amorginum
(from Amorgos),Polygonum pensylvanicum (from Pennsylvania).

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Recommendation73E

73E.1. A new epithet should be written in conformity with the original spelling of the word or words
from which it is derived and in accordance with the accepted usage of Latin and latinization (see Art.
23.5).

Ex. 1. sinensis (notchinensis).

Recommendation73F

73F.1. All specific and infraspecific epithets should be written with a small initial letter, although
authors desiring to use capital initial letters may do so when the epithets are directly derived from the
names of persons (whether actual or mythical), or are vernacular (or non-Latin) names, or are former
generic names.

Recommendation73G

73G.1. A compound name or an epithet which combines elements derived from two or more Greek
or Latin words should be formed, as far as practicable, in accordance with classical usage(see Art.
73.8). This may be stated as follows:

(a) In a true compound, a noun or adjective in non-final position appears as a stem without case
ending with one of the following modifications to derive its compounding forms:

      (1) If the stem ends in a consonant, a connecting vowel (-o- in Greek,-i- in Latin) is inserted
       before a following consonant (Leont-o-podium, stemleont-; cord-i-folius, stemcord-). Before a
       following vowel the connecting vowel is omitted (Leont-ice;cord-atus).

      (2) If the stem ends, or appears to end, in the vowels-a,oe,-o, or-u, this stem vowel is normally
       deleted before a following consonant. For Greek words,-o is substituted (Acantho-panax, stem
      acantha-; Limno-charis, stemlimne-; Cyclo-sorus, stemcyclo-). For Latin words,-i is substituted
       (magnolii-florus, stemmagnolia-; lilii-florus, stemlilio-; querci-folius, stemquercu-), except for the
       raree-stems. Before a following vowel the above stem vowels are deleted and the Greek-o and
       Latin-i are not substituted (Acanth-ella,Limn-anthes,Cycl-anthus,Magnoli-aceae,Lili-ales,
      querc-etum). In certain words the stem vowel may be preserved; this can only be determined by
       comparison with existing classical compounds (Coryne-phorus, stemcoryne-; re-cula,re-al, stem
      re-).

      (3) If the stem ends in the vowels-y,-i, or the rare diphthongs-au,-eu, or-ou, the stem vowel is
       normally preserved (Pachy-phytum,Pachy-anthus, stempachy-; Lysi-machia,Lisi-anthus, stem
      lysi-; Nau-clea, stemnau-). For certain stems, such as those of Greek nouns ending in-y or
       sometimes-i. the connecting vowel-o- is added before a consonant (Ichthy-o-there, stemichthy-;
      Ophi-o-glossum, stemophi-). The Greek diphthong stem endings are normally preserved but
       often undergo changes (Bo-opis, stembou-; oreo-comus, stemoreu-; Basilo-xylon, stembasileu-).

(b) A pseudocompound is a noun or adjectival phrase treated as if it were a single compound word.
       In a pseudocompound, a noun or adjective in a non-final position appears as a word with a case
       ending, not as a modified stem. Examples are:nidus-avis (nest of bird),Myos-otis (ear of mouse),
      cannae-folius (leaf of canna),albo-marginatus (margined with white), etc. Some irregular forms
       have been developed on the analogy of pseudocompounds, such asatro-purpureus (purple with
       black, where the correct phrasing could have beenpurpureus cum atro). Others have been
       deliberately introduced to reveal etymological differences when different word elements have the
       same compounding forms, such astubi- from tube (tubus,tubi, stemtubo-) or from trumpet (tuba,
      tuba, stemtuba-) wheretubaeflorus can only mean trumpet-flowered; alsocarici- is the com-
       pounding form from both papaya (carica,caricae, stemcarica-) and sedge (carex,caricis, stem
      caric-) wherecaricaefolius can only mean papaya-leaved. The latter use of genitive singular of
       First Declension for pseudocompounding is treated as an error to be corrected unless it makes an
       etymological distinction.

(c) Some common irregular forms are used in compounding. Examples arehydro- andhydr- (Hydro-
phyllum) where the regular noun stem ishydat-; calli- (Calli-stemon) where the regular adjective
stem iscalo-; andmeli- (Meli-osma,Meli-lotus) where the regular noun stem ismelit-.

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Gender

74–75

Note 1. The hyphens in the above examples are given solely for explanatory reasons. For the use of
hyphens in botanical names and epithets see Arts.20.3,23.1, and73.9.

Recommendation73H

73H.1. Epithets of fungus names derived from the generic name of the host plant should be spelled in
accordance with the accepted spelling of this name; other spellingsare regarded as orthographic
variantsto be corrected(see Art.75).

Ex. 1. Phyllachora anonicola Chardonis to be altered toP. annonicola, since the spellingAnnona is
now accepted in preference toAnona. –Meliola albizziae Hansford& Deightonis to be altered toM.
albiziae, since the spellingAlbizia is now accepted in preference toAlbizzia.

Recommendation73I

73I.1. The etymology of new names and epithets should be given when the meaning of these is not
obvious.

Article74

[Article 74, dealing with variant spellings of Linnaean generic names, was deleted
by the Sydney Congress, 1981 (but see Art.13.4).]

Article75

75.1. Only oneorthographic variant of any one name is treated as validly
published, the form which appears in the original publication except as provided
in Art.73 (orthographic and typographic errors), Art.14.10 (conserved spel-
lings), and Art.32.5 (incorrect Latin terminations).

Note 1. Orthographic variants are the various spelling, compounding, and inflectional forms of a
name or epithet (including typographic errors), only one type being involved.(For confusingly
similar names based on different types, see Art.64.2-3.)

75.2. If orthographic variants of a name appear in the original publication, the
one that conforms to the rules and best suits the recommendations of Art.73 is to
be retained; otherwise the first author who explicitly adopts one of the variants,
rejecting the other(s), must be followed.

75.3. The orthographic variants of a name are to be automatically corrected to
the validly published form of that name. Whenever such a variant appears in
print, it is to be treated as if it were printed in its corrected form.

S E C T I O N 2 . G E N D E R O F G E N E R I C N A M E S

Recommendation75A

75A.1. A Greek or Latin word adopted as a generic name should retain its gender. When the gender
varies the author should choose one of the alternative genders. In doubtful cases general usage should
be followed. The following names, however, should be treated as feminine in accordance with

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Gender

botanical custom, irrespective ofclassical usage or the authors original usage:Adonis,Diospyros,
Hemerocallis,Orchis,Stachys,andStrychnos.

Ex. 1. The classical gender ofAtriplex varied (e.g. feminine in Columella, neuter in Pliny); Linnaeus
treated the name as feminine and should be followed. However,Phyteuma was consistently neuter
(e.g. Dioscorides, Pliny),Sicyos consistently masculine (Theophrastus, Dioscorides), andErigeron
consistently masculine (Theophrastus, Dioscorides, Pliny), and these should retain their classical
gender even though Linnaeus treated them otherwise.

75A.2. Generic names compounded from two or more Greek or Latin words should take the gender
of the last. If the termination is altered, however, the gender should follow it.

(a) Modern compounds ending in-codon,-myces,-odon,-panax,-pogon,-stemon, and other mascu-
line words should be masculine, irrespective of the fact that the generic namesAndropogon L. and
Oplopanax (Torrey& A. Gray) Miq. were originally treated as neuter by their authors.

(b)   Similarly, all modern compounds ending in-achne,-chlamys,-daphne,-mecon,-osma (the
      modern transcription of the feminine Greek wordosmé) and other feminine words should be
      feminine, irrespective of the fact thatDendromecon Bentham andHesperomecon E. Greene were
      originally ascribed the neuter gender. An exception should be made in the case of names ending in
     -gaster, which strictly speaking ought to be feminine, but which should be treated as masculine in
      accordance with botanical custom.

(c) Similarly, all modern compounds ending in-ceras,-dendron,-nema,-stigma,-stoma and other
      neuter words should be neuter, irrespective of the fact that Robert Brown and Bunge respectively
      madeAceras andXanthoceras feminine. An exception should be made for names ending in
     -anthos (or-anthus) and-chilos (-chilus or-cheilos), which ought to be neuter, since that is
      the gender of the Greek wordsanthos andcheilos, but which have generally been treated as
      masculine and should have that gender assigned to them.

Ex. 2. Compound generic names where the termination of the last word is altered:Stenocarpus,
Dipterocarpus, and all other modern compounds ending in the Greek masculine-carpos (or-carpus),
e.g.Hymenocarpos, should be masculine; those in-carpa or-carpaea, however, should be feminine
e.g.Callicarpa andPolycarpaea; and those in-carpon,-carpum, or-carpium should be neuter, e.g.
Polycarpon,Ormocarpum, andPisocarpium.

75A.3. Arbitrarily formed generic names or vernacular names or adjectives used as generic names,
whose gender is not apparent, should take the gender assigned to them by their authors. Where the
original author has failed to indicate the gender, the next subsequent author may choose a gender,
and his choice should be accepted.

Ex. 3. Taonabo Aublet should be feminine: Aublets two species wereT. dentata andT. punctata.

Ex. 4. Agati Adanson was published without indication of gender: the feminine gender was assigned
to it by Desvaux (J. Bot. Agric. 1: 120. 1813), who was the first subsequent author to adopt the name,
and his choice should be accepted.

Ex. 5. Boehmer (in Ludwig, Def. Gen. Pl. ed. 3. 436. 1760) and Adanson (Fam. Pl. 2: 356. 1763)
failed to indicate the gender ofManihot: the first author to supply specific epithets was Crantz (Inst.
Rei Herb. 1: 167. 1766), who proposed the namesManihot gossypiifolia, etc., andManihot should
therefore be treated as feminine.

75A.4. Generic names ending in-oides or-odes should be treated as feminine and those ending in
-ites as masculine, irrespective of the gender assigned to them by the original author.

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Gender

Recommendation75B

75B.1. When a genus is divided into two or more genera, the gender of the new generic name or
names should be that of the generic name that is retained.

Ex. 1. WhenBoletus is divided, the gender of the new generic names should be masculine:Xeroco-
mus,Boletellus, etc.

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Div.III.1–Div.III.3

Modification of Code

D I V I S I O N I I I . P R O V I S I O N S F O R M O D I F I C A T I O N

O F T H E C O D E

Div.III.1. Modification of the Code. The Code may be modified only by action
of a plenary session of an International Botanical Congress on a resolution
moved by the Nomenclature Section of that Congress.*

Div.III.2. Nomenclature Committees. Permanent Nomenclature Committees
are established under the auspices of the International Association for Plant
Taxonomy. Members of these committees are elected by an International Botan-
ical Congress. The Committees have power to co-opt and to establish subcom-
mittees; such officers as may be desired are elected.
(1) General Committee, composed of the secretaries of the other committees,
      the rapporteur-général, the president and the secretary of the International
      Association for Plant Taxonomy, and at least 5 members to be appointed by
      the Nomenclature Section. The rapporteur-général is charged with the
      presentation of nomenclature proposals to the International Botanical Con-
      gress.
(2) Committee for Spermatophyta.
(3) Committee for Pteridophyta.
(4) Committee for Bryophyta.
(5) Committee for Fungi and Lichens.
(6) Committee for Algae.
(7) Committee for Hybrids.
(8) Committee for Fossil Plants.
(9) Editorial Committee, charged with the preparation and publication of the
      Code in conformity with the decisions adopted by the International Botani-
      cal Congress.Chairman: the rapporteur-général of the previous Congress,
      who is charged with the general duties in connection with the editing of the
      Code.

Div.III.3. The Bureau of Nomenclature of the International Botanical Con-
gress. Its officers are:(1) the president of the Nomenclature Section, elected by

* In the event that there should not be another International Botanical Congress, authority for the
International Code of Botanical Nomenclature shall be transferred to the International Union of
Biological Sciences or to an organization at that time corresponding to it. The General Committee is
empowered to define the machinery to achieve this.

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Modification of Code

Div.III.4

the organizing committee of the International Botanical Congress in question;
(2) the recorder, appointed by the same organizing committee;(3) the
rapporteur-général, elected by the previous Congress;(4) the vice-rapporteur,
elected by the organizing committee on the proposal of the rapporteur-général.

Div.III.4. The voting on nomenclature proposals is of two kinds:(a) a prelimi-
ary guiding mail vote and(b) a final and binding vote at the Nomenclature
Section of the International Botanical Congress.

Qualifications for voting:

(a) Preliminary mail vote:
     (1) The members of the International Association for Plant Taxonomy.
     (2) The authors of proposals.
     (3) The members of the nomenclature committees.

Note 1. No accumulation or transfer of personal votes is permissible.

(b) Final vote at the sessions of the Nomenclature Section:
     (1) All officially enrolled members of the Section. No accumulation or
      transfer of personal votes is permissible.
     (2) Official delegates or vice-delegates of the institutes appearing on a list
      drawn up by the Bureau of Nomenclature of the International Botanical
      Congress and submitted to the General Committee for final approval; such
      institutes are entitled to 1-7 votes, as specified on the list.* Transfer of
      institutional votes to specified vice-delegates is permissible, but no single
      person will be allowed more than 15 votes, his personal vote included.
      Institutional votes may be deposited at the Bureau of Nomenclature to be
      counted in a specified way for specified proposals.

* The Sydney Congress directed that no single institution, even in the wide sense of the term, shall be
entitled to more than 7 votes.

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H.1–H.3

Hybrids

A P P E N D I X I

N A M E S O F H Y B R I D S

ArticleH.1

H.1.1. Hybridity is indicated by the use ofthe multiplication sign × , or by the
addition of the prefix notho-* to the term denoting the rank of the taxon.

ArticleH.2

H.2.1. A hybrid betweennamed taxa may be indicated by placing the multipli-
cation signbetween the names of the taxa; the whole expression is then called a
hybrid formula.

Ex. 1. AgrostisL. × PolypogonDesf.;Agrostis stolonifera L. × Polypogon monspeliensis (L.) Desf.;

Salix aurita L. × S. caprea L.;Mentha aquatica L. × M. arvensis L. × M. spicata L.;Polypodium
vulgare subsp.prionodes Rothm. × subsp.vulgare.

RecommendationH.2A

H.2A.1. It isusually preferable to place the names or epithets in a formula in alphabetical order. The
direction of a cross may be indicated by including the sexual symbols (♀: female; ♂: male) in the
formula, or by placing the female parent first.If a non-alphabeticalsequence is used, its basisshould
beclearly indicated.

ArticleH.3

H.3.1. Hybrids betweenrepresentatives oftwo or more taxa may receivea
name.The hybrid nature of a taxon is indicated by placingthe multiplication
sign× before the name of anintergeneric hybrid or before theepithet of an
interspecific hybrid, orby prefixing the term notho- (optionally abbreviated
n-) to the term denoting the rank of the taxon(see Art.4.1).All such taxa are
designated nothotaxa.

Ex. 1. (Theputative or known parentage is found in Art. H.2, Ex. l.) × Agropogon P. Fourn.;
× Agropogon littoralis (Smith) C. E. Hubb.;Salix × capreola Kerner ex Andersson;Mentha × smi-
thiana R. A. Graham;Polypodium vulgarenothosubsp.mantoniae (Rothm.) Schidlay.

* From the Greeknothos (νοθος) meaning hybrid.

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Hybrids

H.4

H.3.2. A nothotaxon cannot be designated unless at least one parental taxon is
known or can be postulated.

H.3.3. Theepithet of a nothospecies is termed acollective epithet.

H.3.4. For purposes of homonymy and synonymy the multiplication sign and
the prefix notho- are disregarded.

Ex. 2. × HordelymusBacht. & Darevskaja (1950) (= Elymus L. × HordeumL.) is a later homonym
ofHordelymus (Jessen) Jessen(1885).

Note 1. Taxa which are believed to be of hybrid origin need not be designated as nothotaxa.

Ex. 3. The true-breeding tetraploidraisedfrom the artificial crossDigitalis grandifloraL. × D.
purpurea L.may, if desired, be referred to asD. mertonensis Buxton & Darl.;Triticum aestivum L.is
treated as a species although it is not found in nature and its genome has been shown to be composed
of those ofT. monococcum,Aegilops speltoides, andA. squarrosa; the taxon known asPhlox
divaricata subsp.laphamii (Wood) Wherry is believed by Levin (Evolution 21: 92-108. 1967) to be a
stabilized product of hybridization betweenP. divaricata L. subsp.divaricata andP. pilosa subsp.
ozarkana Wherry.

Note 2. The term collective epithet isused in the International Code of Nomenclature for Cultivat-
ed Plants-1980 to include also epithets in modern language.

RecommendationH.3A

H.3A.1. The multiplication sign in the name of a nothotaxon should be placed against the initial
letter of the name or epithet. However, if the mathematical symbol is not available and the letterx is
used instead, a single letter space may be left between it and the epithet if this helps to avoid
ambiguity. The letterx should be in lower case.

ArticleH.4

H.4.1. Whenall the parent taxa can be postulated or are known, a nothotaxon is
circumscribed so as to include all individuals (as far as they can be recognized)
derived from thecrossing of the stated set ofparent taxa (i.e. not only theFı but
subsequent filialgenerations and also back-crosses and combinations of these).
There can thus be only one correctname corresponding to a particular hybrid
formula;this is the earliest legitimate name (see Art.6.3)in the appropriate rank
(Art. H.5), and other names to which the same hybrid formula applies are
synonyms of it.

Ex. 1. The namesOenothera × wienii Renner ex Rostański (1977) andO. × hoelscheri Renner ex
Rostański (1968) are both considered to apply to the hybridO. rubricaulis × O. depressa; the types of
the two nothospecific names are known to differ by a whole gene-complex; nevertheless, the later
name is treated as a synonym of the earlier.

Note 1. Variation within nothospecies and nothotaxa of lower rank may be treated according to Art.
H.12 or, if appropriate, according to the International Code of Nomenclature for Cultivated Plants-
1980.

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H.5–H.6

Hybrids

ArticleH.5

H.5.1. A nothotaxon hasthe same rank as its postulated or knownparent taxa.

H.5.2. If the postulated or known parent taxa are of unequal rank the nothotax-
on must have the lower rank (see Art.H.11.2).

ArticleH.6

H.6.1. A nothogeneric name (i.e. the name atgeneric rank for ahybrid between
two or more genera)is a condensed formula or is equivalent to a condensed
formula.

H.6.2. Thenothogeneric name of a bigeneric hybrid is a condensed formulain
which the namesadopted for the parental generaarecombined into a single
word, using the first part or the whole of one, the last part or the whole of the
other(but not the whole of both) and, if desirable, a connecting vowel.

Ex. 1. × AgropogonP. Fourn. (=Agrostis × Polypogon); × GymnanacamptisAsch. & Graebner
(=Anacamptis × Gymnadenia); × Cupressocyparis Dallimore(=Chamaecyparis × Cupressus);
× Seleniphyllum Rowley (=Epiphyllum ×Selenicereus).

Ex. 2. × Amarcrinum Coutts (1925) is correct forAmaryllis L. × Crinum L., not × Crindonna
Ragion. (1921). The latter name was proposed for the same nothogenus, but was formed from the
generic name adopted for one parent (Crinum) and a synonym (Belladonna Sweet) of the generic
name adopted for the other (Amaryllis). Being contrary to Art. H.6, it is not validly published under
Art.32.1(b).

Ex. 3. The name × Leucadenia Schlechter is correct forLeucorchis E. Meyer × Gymnadenia R. Br.,
but if the generic namePseudorchis Séguier is adopted instead ofLeucorchis, × Pseudadenia P. Hunt
is correct.

Ex. 4. × Aporophyllum Johnson when first published was defined asAporocactus × members of the
Orchid Cacti. The latter constitute the epicacti (epiphyllums of horticulture)—a complex descend-
ed from 4 or 5 separate genera. This name is hence not validly published (Art.32.1(b)) because it
conflicts with Art. H.6.3. For the bigeneric hybridAporocactus × Epiphyllum a different name
applies( × Aporepiphyllum Rowley).

Ex. 5. Boivin (1967) published × Maltea for what he considered to be the intergeneric hybrid
Phippsia × Puccinellia. As this is not a condensed formula, the name cannot be used for that
intergeneric hybrid, for which the correct name is × Pucciphippsia Tzvelev (1971). Boivin did,
however, provide a Latin description and designate a type; consequently,Maltea is a validly
published generic name and is correct if its type is treated as belonging to a separate genus, not to a
nothogenus.

H.6.3. Thenothogeneric name of an intergeneric hybrid derived from four or
more genera is formed from the name of a collector, grower, or student of the
group, to which is added the termination-ara; no such name may exceed eight
syllables. Such a name is regarded as a condensed formula.

Ex. 6. × Potinarahort. (=Brassavola × Cattleya × Laelia × Sophronitis).

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Hybrids

H.7–H.8

H.6.4. Thenothogeneric name of a trigeneric hybridis either(a) a condensed
formula in whichthe three names adopted forthe parentalgenera arecombined
into a single word not exceeding eight syllables,using the whole or first part of
one, followed by the whole or any part of another, followed by the whole or last
part of the third (but not the whole of all three) and, if desirable, one or two
connecting vowels, or(b) a name formed like that of a nothogenus derived from
four or more genera, i.e., from a personal name to which is added the termination
-ara.

Ex. 7. × Sophrolaeliocattleyahort. ( =Cattleya × Laelia × Sophronitis); × Vascostylis hort. (=
Ascocentrum × Rhynchostylis × Vanda); × Rodrettiopsis Moir ( =Comparettia × Ionopsis ×
Rodriguezia); × Wilsonarahort. ( =Cochlioda × Odontoglossum × Oncidium).

ArticleH.7

H.7.1. The nameof a nothotaxon which is a hybridbetween subdivisions of a
genusis a combination of anepithet, whichis a condensed formula formed in the
same way as anothogeneric name (Art.H.6.2), with the name of the genus.

Ex. 1. × Ptilostemonnothosect.Platon Greuter (Boissiera 22: 159. 1973), comprising hybrids between
Ptilostemon sect.Platyrhaphium Greuter andP. sect.Ptilostemon; Ptilostemonnothosect.Plinia
Greuter (Boissiera 22: 158. 1973), comprising hybrids betweenPtilostemon sect.Platyrhaphium and
P. sect.Cassinia Greuter.

ArticleH.8

H.8.1. When the name or epithet of anothotaxon is a condensed formula (Arts.
H.6andH.7),the parental names used in its formation must be those which are
correct for the particular circumscription, position, and rankaccepted for the
parental taxa.

Ex. 1. If the genusTriticum L. is interpreted on taxonomic grounds as includingTriticum (s. str.) and
Agropyron Gaertner, and the genusHordeum L. as includingHordeum (s. str.) andElymus L., then
hybrids betweenAgropyron andElymus as well as betweenTriticum (s. str.) andHordeum (s. str.) are
placedin the same nothogenus, × Tritordeum Asch. & Graebner(1902). If, however,Agropyronis
separated generically fromTriticum, hybrids betweenAgropyron andHordeum (s. str.or s. lat.)
are placedin the nothogenus × AgrohordeumA. Camus(1927). Similarly,ifElymus is separated
generically fromHordeum,hybrids betweenElymus andTriticum (s. str.or s. lat.)are placedin the
nothogenus × Elymotriticum P. Fourn. (1935). If bothAgropyron andElymusare given generic
rank, hybrids between them are placed in the nothogenus × AgroelymusA.Camus (1927); × Tritor-
deum is then restricted to hybrids betweenHordeum (s. str.) andTriticum (s. str.),andhybrids
betweenElymus andHordeum are placed in × Elyhordeum Mansf. ex Tsitsin & Petrova (1955), a
substitute name for × Hordelymus Bacht. & Darevskaja (1950) nonHordelymus (Jessen) Jessen
(1885).

H.8.2. Names ending in-ara for nothogenera, which are equivalent to con-
densed formulae (Art.H.6.3-4),areapplicable only to plantswhich are accepted
taxonomically as derived from the parents named.

Ex. 2. IfEuanthe is recognized as a distinct genus, hybrids simultaneously involving its only species,

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H.9–H.10

Hybrids

E. sanderiana, and the three generaArachnis,Renanthera, andVanda must be placed in × Cogniauxa-
raGaray & H. Sweet; if on the other handE. sanderiana is included inVanda, the same hybrids are
placed in × Holttumarahort. (Arachnis × Renanthera × Vanda).

ArticleH.9

H.9.1. In order to be validly published, the name of anothogenus orof a
nothotaxon with the rank of subdivision of a genus(Arts.H.6andH.7) must be
effectively published (see Art.29) with a statement of the names of the parent
genera or subdivisions of genera, but no description or diagnosis is necessary,
whether in Latin or in any other language.

Ex. 1. Validly published names: × Philageria Masters(1872), published with a statement of parent-
age,Lapageria × Philesia; Eryngiumnothosect.Alpestria Burdet & Miège,pro sect. (Candollea 23:
116. 1968), published with a statement of its parentage,Eryngium sect.Alpina × sect.Campestria;
× Agrohordeum A.Camus (1927) (=Agropyron Gaertner × Hordeum L.), of which × Hordeopyron
Simonet (1935,Hordeopyrum) is a later synonym.

Note 1. Since the names of nothogenera and nothotaxa with the rank of a subdivision of a genus are
condensed formulae or treated as such, they do not have types.

Ex. 2. The name × Ericalluna bealei Krüssm. (1960) was published for plants which were thought to
be variants of the crossCalluna vulgaris × Erica cinerea. If it is considered that these are not hybrids,
but are forms ofErica cinerea, the name × Ericalluna Krüssm. remains available for use if and when
known or postulated plants ofCalluna × Erica should appear.

Ex. 3. × Arabidobrassica Gleba & Fr. Hoffm. (Naturwissenschaften 66: 548. 1979), a nothogeneric
name which was validly published with a statement of parentage for the result of somatic hybridiza-
tion by protoplast fusion ofArabidopsis thaliana withBrassica campestris, is also available for
intergeneric hybrids resulting from normal crosses betweenArabidopsis andBrassica, should any be
produced.

Note 2. However, names published merely in anticipation of the existence of a hybrid are not validly
published under Art.34.1(b).

ArticleH.10

H.10.1. Names of nothotaxa at the rank of species or below must conform with
the provisions(a) in the body of the Code applicable to the same ranks and(b)
in Art.H.3. Infringements of Art.H.3.1 . are to be corrected.

H.10.2. Taxa previously published as species or infraspecific taxa which are later
considered to be nothotaxa may be indicated as such, without change of rank, in
conformity with Arts.3 and4 and by the application of Art.50 (which also
operates in the reverse direction).

H.10.3. Thefollowingare considered to be formulae and not true epithets:
designations consisting of the epithets of the names of the parents combined in
unaltered form by a hyphen, or with only the termination of one epithet changed,
or consisting of the specific epithet of the name of one parent combined with the
generic name of the other (with or without change of termination).

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Hybrids

H.11

Ex. 1. The designationPotentilla atrosanguinea-pedata published by Maund (Bot. Gard. 5: no. 385,
t. 97. 1833) is considered to be a formula meaningPotentilla atrosanguinea Lodd. ex D. Don × P.
pedata Nestler.

Ex. 2. Verbascum nigro-lychnitis Schiede (Pl. Hybr. 40. 1825) is considered to be a formula,
Verbascum lychnitisL. × V. nigrumL.; the correct binary name for this hybrid isVerbascum
× schiedeanum Koch (1844).

Ex. 3. The following names include true epithets:Acaena × anserovinaOrch. (1969) (fromanserini-
folia andovina);Micromeria × benthamineolens Svent. (1969) (frombenthamii andpineolens).

Note 1. Since the name of a nothotaxon at the rank of species or below hasa type, statements of
parentage play a secondary partin determining the application of the name.

Ex. 4. Quercus × deamii Trel. was described asQ. alba L. × Q. muehlenbergii Engelm. However,
progeny grown from acorns from the type tree led Bartlett to conclude that the parents were in factQ.
macrocarpa Michx. andQ. muehlenbergii.If this conclusion is accepted, the nameQ. × deamiiapplies
toQ. macrocarpa × Q. muehlenbergii,and not toQ. alba × Q. muehlenbergii.

RecommendationH.10A

H.10A.1. In forming epithets for nothotaxa at the rank of species and below, authors should avoid
combining parts of the epithets of the names of the parents.

RecommendationH.10B

H.10B.1. For hybrids betweennamed infraspecific taxatheuse ofhybrid formulae is more informa-
tive, and entails less danger of confusion, thanthe naming of nothotaxa.

ArticleH.11

H.11.1. Thename of a nothospecies of which the postulated or known parent
species belong to different genera is a combination of a nothospecific (collective)
epithet with a nothogeneric name.

Ex. 1. × Heucherella tiarelloidesWehrh. ex Stearn (considered to beHeuchera × brizoideshort.
×Tiarella cordifolia L., for whichHeuchera × tiarelloidesis incorrect).

Ex. 2. WhenOrchis fuchsii Druce was renamedDactylorhiza fuschsii (Druce) Soó the name × Orchi-
coeloglossum mixtum Asch. & Graebner (for its hybrid withCoeloglossum viride (L.) Hartman)
became the basis of the necessary new combination × Dactyloglossum mixtum (Asch. & Graebner)
Rauschert (1969).

H.11.2. The epithet of an infraspecific nothotaxon, of which the postulated or
known parental taxa are assigned to different taxa at a higher rank, may be
placed subordinate to the name of a nothotaxon at that higher rank (see Art.
24.1). If this higher-ranking nothotaxon is a nothospecies the name of the
subordinate nothotaxon is a combination of its epithet with the nothospecific
name (but see Rec.H.10B).

Ex. 3. Mentha × piperita L. nothosubsp.piperita(=M.aquatica L. × M.spicata L. subsp.spicata);
Mentha × piperita nothosubsp.pyramidalis (Ten.) R. Harley ( =M. aquatica L. × M. spicata subsp.
tomentosa (Briq.) R. Harley).

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H.12

Hybrids

ArticleH.12

H.12.1. Subordinate taxa within nothotaxa of specific or infraspecific rank may
be recognized without an obligation to specify parent taxa at the subordinate
rank. In this case non-hybrid infraspecific categories of the appropriate rank are
used.

Ex. 1. Mentha × piperita formahirsuta Sole;Populus × canadensis var.serotina (Hartig) Rehder and
P. × canadensis var.marilandica (Poiret) Rehder (see also Art. H.4,Note 2).

Note 1. As there is no statement of parentage at the rank concerned there is no control of
circumscription at this rank by parentage (compare Art.H.4.).

Note 2. It is not feasible to treat subdivisions of nothospecies by the methods of both Art.H.10 and
H.12.1 at the same rank.

H.12.2. Namespublished at the rankof nothomorph* are treated as having
been published as names of varieties (see Art.50).

A P P E N D I X I I

NOMINA FAMILIARUM CONSERVANDA see pp.249-269.

A P P E N D I X I I I

NOMINA GENERICA CONSERVANDA ET REJICIENDA see pp.270-426.

A P P E N D I X I V

NOMINA UTIQUE REJICIENDA see p. 427.

* Previous editions of the Code (1978, Art.H.10, and the corresponding article in earlier editions)
permitted only one rank under provisions equivalent to H.12. That rank was equivalent to variety
and the category was termed nothomorph.

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Guide types

T.1–T.4

G U I D E F O R T H E D E T E R M I N A T I O N O F T Y P E S

The following is intended as a guide to the determination or selection of the
nomenclatural types of previously publishednames. Where the application of a
rule is concerned, reference is made to the appropriate Article.

T.1. The choice made by the original author, if definitely expressed at the time of
the original publication of the name of the taxon, is final. If he included only one
element, that one must always be accepted as theholotype (Arts.7,9,10). If a new
name is based on a previously published description of the taxon, the same
considerations apply to material cited by the earlier author.

T.2. A new name published as an avowed substitute (nomen novum) for an older
name is typified by the type of the older name (Art.7.9).

T.3. Alectotype may be chosen only when an author failed to designate a
holotype, or when, for species or taxa of lower rank, the type has been lost or
destroyed (Art.7.4).

T.4. Designation of a lectotype should be undertaken only in the light of an
understanding of the group concerned.In choosing a lectotype, all aspects of the
protologue should be considered as a basic guide. Mechanicalmethods, such as
the automatic selection of the first species or specimen cited or of a specimen
collected by the person after whom a species is named, should be avoided as
unscientific and productive of possible future confusion and further change (see
Art.8.).

(a) A lectotype must be chosen from among elements that were definitely
studied by the author up to the time the name of the taxon was published.

(b) A specimenis to be given preference over pre-Linnaean or other cited
descriptions or illustrations when lectotypesof names of species or infra-
specific taxa are designated (see Art.9.3)

(c) If a holotype was designated by the original author and has been lost or
       destroyed, anisotype (Art.7.6), if such exists, must be chosen as the lecto-
       type. If no holotype was designated by the original author and ifsyntypes
       (Art.7.7) exist, one of them must be chosen as the lectotype. If no holotype
       was designated by the original author and if no syntypes are extant, the

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T.5–T.6

Guide types

       lectotype should be chosen from among duplicates* of the syntypes (isosyn-
      types), if such exist. If neither an isotype, a syntype, nor an isosyntype is
       extant, aparatype** if such exists, may be chosen as lectotype.

(d) In choosing a lectotype, any indication of intent by the author of a name
       should be given preference unless such indication is contrary to the proto-
       logue. Such indications are manuscript notes, annotations on herbarium
       sheets, recognizable figures, and epithets such astypicus,genuinus,vulgaris,
      communis, etc.

(e) In cases where two or moreheterogeneous elements were included in or cited
       with the original description,the lectotype should be so selected as to
      preserve current usage.In particular, if another author has already segregat-
       ed one or more elements as other taxa, the residue or part of it should be
       designated as the lectotype provided that this element is notin conflict with
       the original description or diagnosis. If it can be shown that the elementthus
      selected isin serious conflictwith the protologue, then one of the previously
       segregated elements is to be selected as the lectotype.

(f) The first choice of a lectotype must be followed by subsequent workers (Art.
      8) unless theholotype is rediscovered, or unless it can be shown that the
       choice wasin serious conflict with the protologue, orthat it wasbased on a
      largely mechanicalmethod of selection (seealso Art.9.2).

T.5. A neotype may be designated only when allof the originally cited material
or material seen by the author but not cited,and its duplicates,are believed lost
or destroyed; a neotype may be selected from any material that is not original

material(Art.7.8). In selecting aneotypeparticularcare and critical knowledge
are essential, as the reviewer usually has no guide except his own judgment as to
what best fits the protologue. If his selection proves to be faulty it will inevitably

result in further change.The first choice of a neotype must be followed by
subsequent workers unlessany of the original material is rediscovered, or unless
the choice neglected an available lectotype, or if it can be shown that the choice was
in serious conflict with the protologue. A lectotype always takes precedence over
a neotype (Art.7.4).

T.6. For the name of a fossil species, the lectotype, when one is needed, should, if
possible, be a specimen illustrated at the time of the first valid publication (Art.
7.15).

* The word duplicate is here given its usual meaning in herbarium curatorial practice. It is part of a
single gathering made by a collector at one time. However, the possibility of a mixed gathering must
always be considered by an author choosing a lectotype and corresponding caution used.

** A paratype is a specimen cited in the protologue other than the holotype, isotype(s), or syntypes.
In most cases where no holotype was designated there will also be no paratypes, since all the cited
specimens will be syntypes. However, in cases where an author cited two or more specimens as types
(Art.7.5) the remaining cited specimens are paratypes and not syntypes.

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