Abstract
In this work the author presents a taxonomic study of the qenus Miconia Ruiz et Pav., section Chaenanthera Naudin, occurring in the State of Rio de Janeiro. The tratment given to the section marks out three species and two varieties with descriptions, illustrations and photographs, emphasizing the type of dehiscence and the shape of the anthers, the occurrence of domatias, the margin of the leaves, as well as a study of the hairiness of the inflorescence, hypanthium, ovary and fruit. New synonyms are placed to M. pusilliflora and M. rigidiuscula, and a key for the recognition of the species and varieties are presented too.