Orthomene comprises four species distributed from Central to South America, of which three occur in phytogeographic domains of Brazil. In Brazil, Amazonia is the main center of diversity for the genus. This work is a taxonomic treatment of Orthomene in Brazil and involved analyzing field collections (between January 2017 and July 2018), types and botanical specimens from 32 national and foreign herbaria. The three species in the study area are Orthomene hirsuta,Orthomene prancei and Orthomene schomburgkii. The latter is the most common and widely distributed species of the genus in the country. An identification key, descriptions, illustrations, distribution data, and additional comments for each species are provided.
de Sousa, J. dos S., Gurgel, E. S. C., & Bastos, M. de N. do C. (2019). Orthomene (Menispermaceae) in the Brazilian amazon. Acta Amazonica, 49(2), 139–144. https://doi.org/10.1590/1809-4392201802351