A taxonomic survey of the genera Aciotis, Acisanthera, Marcetia and Pterolepis (Melastomeae, Melastomataceae) in Rio de Janeiro state is presented here. The four genera were studied and they are represented in Rio de Janeiro by one species each: Aciotis paludosa, Acisanthera variabilis, Marcetia taxifolia and Pterolepis glomerata. In this paper, the Rio de Janeiro species list has been updated, removing six species mistakenly listed. Tibouchina sensu lato will be presented in a separate paper, with its species segregated between Chaetogastra and Pleroma (that includes Itatiaia). The present taxonomic treatment includes an identification key, descriptions, comments on taxonomy, data on geographic distribution, categorization of extinction risk under IUCN criteria, list of examined material and illustrations.
Taxonomy; floristics; Southeastern Brazil
