A taxonomic treatment of Pfaffia in Brazil is presented. It is a neotropical genus and Brazil is considered as the main diversity center. Pfaffia species occur mainly in open vegetation "cerrados", "campos rupestres", grasslands, forest edges, galery forests, and bruschwoods. The genus is represented in Brazil by 20 species. Descriptions, identification keys, nomenclatural comments, illustrations of the diagnostic caracters are presented together with information about geographic distibution and habitats.
Amaranthaceae; neotropics; Pfaffia; taxonomy
