N. Vietnam, prov. Cao Bang, distr. Nguyen Binh, municipality Ca Thanh, vicinities of Ta Phinh village (N 22°44′ E 105°50′). Secondary open broadleaved forest on steep slopes and bluffs of remnant karst limestone ridge at 1200-1250 m elev. Woody vine up to 20 m lg in open rocky place. Flowers light pink-violet. Not common.
CBL 1576 19 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)