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 mossy forest along rocky tops of remnant karst limestone ridge at 1200-1240 m elev. Forb vine 3-5 m lg on open place. Not common.
NTH 2967 29 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)