| Zygophyllales | |
|---|---|
 | |
| Guaiacum officinale | |
Scientific classification | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Clade: | Fabids |
| Order: | Zygophyllales Link 1829 |
| Families | |
TheZygophyllales are anorder ofdicotyledonousplants, comprising the following two families:
According to theAngiosperm Phylogeny Group (APG II) both families are unplaced to order, but nevertheless included in theEurosids I.[1] The APG III system of 2009, however, recognized this order. Even if the monogeneric family Krameriaceae shares few common traits with the family Zygophyllaceae, researchers see little advantage in keeping it as a separate family (e.g. Sheahan and Chase). The name Zygophyllales can be used if one finds it appropriate to place both families into an order.[2] The order remains unchanged in the APG IV system.[3]
Under theCronquist system, the Zygophyllaceae were included within theSapindales, and the Krameriaceae within thePolygalales.
| Family and acommon name[4] | Type genus andetymology | Total genera; global distribution | Description and uses |
|---|---|---|---|
| Krameriaceae (ratany family) | Krameria, forWilhelm Heinrich Kramer (1724–1765)[4] | 1 genus, in southern North America and dry parts of South America[4][5] | Parasitic shrubs and herbaceous perennials.Krameria triandra is used as anastringent in mouthwash and toothpaste.[4][5] |
| Zygophyllaceae (twinleaf family) | Zygophyllum, from Greek for "yoked leaves"[4][6] | 22 genera, scattered worldwide, mostly in dry tropical to temperate zones[4][5] | Shrubs, trees and herbaceous plants, frequently with jointed branches, sometimes with thorns.Guaiacum yields exceptionally hard lumber.[4][5] |
Orders offlowering plants (APG IV) | ||||||||||||||||||||||||||||||||||||||||||||||||||
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