N. Vietnam, prov. Cao Bang, distr. Tra Linh, municipality Luu Ngoc, vicinities of Lung Mu village (N 22°47′ E 106°18′), about 14 km from Cao Bang town to the N. Secondary evergreen broadleaved closed forest on steep slopes of foothills of remnant limestone ridge at 650 m alt. Epilite vine up to 3-5 m lg on open rocks. Common.
CBL 1166 13 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)