Revision of Ochrosia (Apocynaceae) in Malesia

The genus Ochrosia Juss. is revised in the Malesian region. Thirteen species are recognized as Ochrosia, including one new species, O. basistamina. Seven species previously placed in Neisosperma Raf. are now included in Ochrosia. The names Ochrosia section Echinocaryon F. Muell. and Ochrosia section Ochrosia are applied for the fibrous-fruited species and cavity-fruited species of Ochrosia, respectively. Neisosperma Raf. is reduced to Ochrosia section Echinocaryon F. Muell. Separate keys are given for the species of both sections.