S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 35 km to NE from Dalat city. Closed primary broadleaved evergreen mt forest with Pinus krempfii on W macroslope of Gia Rinh mt. ridge at 1700-1800 m alt. (N 12° 09′, E 108° 41′). Herb vine up to 6-8 m lg in open place. Flowers yellowish. Very common. VH 4057 18.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)