WikiProject Plants

This is anessay. It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one ofWikipedia's policies or guidelines, as it has not beenthoroughly vetted by the community. Some essays represent widespread norms; others only represent minority viewpoints.

The categories associated with individual plant species, such asCategory:Plants described in 2009, include species described in that year. The following guidelines or suggestions are meant to keep these categories consistent.

Note: the guidelines here only apply to organisms covered by theICN. Different guidelines apply to organisms covered by theICZN.

First, note that these categories only apply to articles aboutspecies, not those about taxa at other ranks. This is becauseCategory:Plants described in 2009, for example, is a subcategory ofCategory:Species described in 2009.

Second, "described in year" is meant to indicate that a species wasfirst formally and validly described according to the rules of theInternational Code of Nomenclature for algae, fungi, and plants (ICN) in that year (thus the earliest possible date is 1753). Usereliable sources to figure out the proper category. If the name has remained unchanged, theInternational Plant Names Index is a good source. Other databases, such as theWorld Checklist of Selected Plant Families orThe Plant List are often better for tracking name changes back to the earliest formal description. Note that there may have been a change of rank, e.g. what is now accepted as a species may have been first described at an infraspecific rank. If so, the date of that description is used.

Some examples:

• Carex vulpinoideaMichx. was described in 1803, so the article is placed inCategory:Plants described in 1803.
• Castilleja attenuata(A.Gray) T.I.Chuang & Heckard. Theauthor citations after this plant name mean that Asa Gray was the first person to describe this species (in 1857 asOrthocarpus attenuatus) and in 1991, T.I.Chuang & Heckard reassessed the species and altered the name (in this case, they moved it to another genus and altered the species gender to match). As a general rule, the species article should be categorized by the earliest formal, valid description, so this species is placed inCategory:Plants described in 1857.
• Muscari racemosumMill. was first described by Linnaeus in 1753 asHyacinthus muscari. When it was transferred to Miller's genusMuscari in 1768, the specific epithet had to change (as the ICN does not allow the same genus name and specific epithet), so there is no "(L.)" in the authority. Nevertheless, the earliest formal description was by Linnaeus, so the article is placed inCategory:Plants described in 1753.
• Utricularia quinquedentataF.Muell. ex P.Taylor. The "ex" in this author abbreviation indicates that F.Muell. (Ferdinand von Mueller) did not fully or validly publish the species. In this case, he only suggested a name without a description in 1893. Peter Taylor found the reference and published a description based on Mueller's specimens in 1986, so this article is placed inCategory:Plants described in 1986.
• Euonymus fortunei(Turcz.) Hand.-Mazz. was described under the nameElaeodendron fortunei by Turczaninow in 1863 before being transferred toEuonymus in 1933. It was later discovered that the species had previously been described asEuonymus hederaceus in 1851.Elaeodendron fortunei has beenconserved againstEuonymus hederaceus. Although the 1851 name is now rejected, it was used in the first formal and valid description, so this article is placed inCategory:Plants described in 1851.

For reference, the diagram below shows how an article about a plant species fits into the category hierarchy. Parallel hierarchies exist for animal species, fungal species, etc. Start atCategory:Plants by year of formal description to explore the plant categories.

Note that the English Wikipedia defines centuries as perMOS:CENTURY; e.g. the 19th century runs from 1801 to 1900. ("Plants described in DECADE" categories were eliminated by consensus in September 2018.)

Not all plant species articles are categorized by year of description, but nevertheless a cumulative plot may be of interest. The rate of description of plant species that are included here shows no signs of diminishing!

It's not possible to reference, and hence directly justify, the addition of categories to an article. So when a year category is present, it is desirable to explain it, at least briefly, in the Taxonomy section, with a suitable secondary source. For example,

• A b was first named and described in 1888 by Joe Bloggs.¹
• A b was first named and described in 1888 by Joe Bloggs, and transferred to the genusC asC d (sinceC b already existed) by Jane Smith in 1905.²

This ensures that the category "Plants described in 1888" is supported in the text.

• Wikipedia essays
• WikiProject Plants
• Wikipedia essays about categorization
• Wikipedia categorization by topic