N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac, vicinities of Yen Lac village (N 22°44′ E 105°50′), about 44 km to NWW from Cao Bang town. Primary evegreen closed broadleaved forest on steep mt slopes of limestone ridge at 1300 m alt. Herb creeping epiphyte vine 8-10 m lg. Rare.
CBL 306 15 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)