<italic>Janusia longibracteolata</italic> (Malpighiaceae), a new endemic species from semideciduous forests, Brazil.

<italic>Janusia</italic> is a South American genus of flowering plants. Most of its 15 described species are centered in Brazil, where they are found in diverse habitats across the Caatinga and Cerrado biomes, and a few other species can be found in the Atlantic Forest region. This paper describes <bold><italic>Janusia longibracteolata,</italic></bold> a new species endemic to semideciduous forests in the state of Bahia, Brazil, at elevations of 900 to 1000 m. This study was based on fieldwork and a study of herbarium collections, which resulted in photos, dried preserved material, and information about the new species and its environment. The most notable morphological characters that distinguish the new species are its subulate floral bracts and bracteoles, which are the largest known in the genus. This new species is described, illustrated, and compared with the other species in <italic>Janusia</italic>. This novelty underscores the need to preserve Bahia's remaining semideciduous forests and to increase botanical exploration in this region. [ABSTRACT FROM AUTHOR]