Ochnaceae s.s., Quiinaceae and Medusagynaceae are phylogenetically related and sometimes treated as Ochnaceae s.l., but only the first ones are recorded to Brazil. Ochnaceae s.s. occurs in tropical and subtropical while Quiinaceae is exclusively neotropical and predominantly distributed in the Amazon forest. In northeastern Brazil, the recognized genera are Elvasia DC., Luxemburgia A.St.-Hil., Ouratea Aubl., and Sauvagesia L. (Ochnaceae s.s.), and Lacunaria Ducke and Quiina Aubl.(Quinaceae). In the Usina São José is represented by Ouratea castaneifolia (DC.) Engl., O. crassa Tiegh., O. hexasperma (A.St.-Hil.) Baill., and Sauvagesia erecta L. (Ochnaceae s.s.), and Quiina florida Tul. (Quiinaceae). This study includes identification key, descriptions, general comments about the species and habitats, and illustrations.
taxonomy; Atlantic rainforest; Ochnaceae; Quiinaceae
