N. Vietnam, prov. Son La, distr. Moc Chau, municipality Chieng Hac, vicinities of Co Liu village (N 20°51′ E 104°38′). Primary evergreen broadleaved wet forest on very steep slopes and bluffs of remnant karst limestone ridge at 700 m elev. Shrub 1-2 m hg in wet open place. Flowers white. Common.
NTH 2932 29 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)