Fl. Gén. Indo-Chine 3: 1126 (1933).
LECTOTYPE. — Pierre 96 (HM), Vietnam, Dông Nai, Mt Dinh, designated by L´y, Feddes Repert. 97: 435 (1986).
Second step lectotypification, designated here (there were three undifferentiated specimens of Pierre 96 at HM).