Pterostemonaceae (Engl.) Small is a small family of shrubs native to tropical and subtropical

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

. The family was recognized by scientists working with the

Angiosperm Phylogeny Group The Angiosperm Phylogeny Group (APG) is an informal international group of systematic botanists who collaborate to establish a consensus on the taxonomy of flowering plants (angiosperms) that reflects new knowledge about plant relationships disc ...

but is placed in the

Grossulariaceae ''Ribes'' is a genus of about 200 known species of flowering plants, most of them native to the temperate regions of the Northern Hemisphere. The various species are known as currants or gooseberries, and some are cultivated for their edible ...

by other taxonomic systems. The

APG II system The APG II system (Angiosperm Phylogeny Group II system) of plant classification is the second, now obsolete, version of a modern, mostly molecular-based, system of plant taxonomy that was published in April 2003 by the Angiosperm Phylogeny Gr ...

recognized the family as containing a single genus, ''Pterostemon''. The APG III system of 2009, and later versions, do not recognize this family and place ''Pterostemon'' within the

Iteaceae Iteaceae is a flowering plant family of trees and shrubs native to the eastern USA, southeastern Africa, and south and Southeastern Asia. Some older taxonomic systems place the genus ''Itea'' in the family Grossulariaceae. The APG III system o ...

in the order

Saxifragales The Saxifragales (saxifrages) are an order of flowering plants (Angiosperms). They are an extremely diverse group of plants which include trees, shrubs, perennial herbs, succulent and aquatic plants. The degree of diversity in terms of vegeta ...

References

Pterostemonaceae
in Stevens, P. F. (2001 onwards). Saxifragales families Monogeneric plant families Flora of Mexico Historically recognized angiosperm families {{Saxifragales-stub