S. Vietnam, Prov. Khanh Hoa, distr. Khanh Son, 42 km to NE from Dalat city. Primary closed broadleaved evergreen forest on E macroslope of Hon Giao mt. ridge at 1600-1700 m alt. (N 12° 12′, E 108° 44′). Creeping epiphytic vine up to 2 m lg. Not common. VH 4346 25.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)