N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac, vicinities of Yen Lac village (N 22°44′ E 105°50′). Primary semideciduous broadleaved forest on steep slopes and bluffs of S. exposition near the tops of remnant karst limestone ridge at 1200-1300 m elev. Tree about 10-12 m hg. Flowers light greenish. Common.
CBL 1458 16 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)