Zygophyllales

The Zygophyllales are an order of dicotyledonous plants, comprising the following two families:

• Family Zygophyllaceae
• Family Krameriaceae

According to the Angiosperm Phylogeny Group (APG II) both families are unplaced to order, but nevertheless included in the Eurosids I.<ref name="apgii"/> 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.<ref name="apgiii"/> The order remains unchanged in the APG IV system.<ref name="apgiv"/>

Under the Cronquist system, the Zygophyllaceae were included within the Sapindales, and the Krameriaceae within the Polygalales.

List of families

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Family and a common name<ref name="Christenhusz"/>	Type genus and etymology	Total genera; global distribution	Description and uses
Krameriaceae (ratany family)	Krameria, for Wilhelm Heinrich Kramer (1724–1765)<ref name="Christenhusz"/>	1 genus, in southern North America and dry parts of South America<ref name="Christenhusz"/><ref name="POWO"/>	Parasitic shrubs and herbaceous perennials. Krameria triandra is used as an astringent in mouthwash and toothpaste.<ref name="Christenhusz"/><ref name="POWO"/>
Zygophyllaceae (twinleaf family)	Zygophyllum, from Greek for "yoked leaves"<ref name="Christenhusz"/><ref name="IPNI"/>	22 genera, scattered worldwide, mostly in dry tropical to temperate zones<ref name="Christenhusz"/><ref name="POWO"/>	Shrubs, trees and herbaceous plants, frequently with jointed branches, sometimes with thorns. Guaiacum yields exceptionally hard lumber.<ref name="Christenhusz"/><ref name="POWO"/>

References

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