N. Vietnam, prov. Cao Bang, distr. Thach An, about 28 km to SE from Cao Bang town (N 22°29′ E 106°28). Primary evergreen broadleaved closed forest on steep slopes of remnant limestone ridge at 300-450 m alt. Climbing shrub or woody vine up to 4-5 m lg in open place. Not rare.
CBL 934 06 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)