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 1500-1600 m alt. (N 12° 12′, E 108° 44′). Creeping epiphytic and epilitic vine in shadow wet mt slopes of deep stream canyon. VH 4268 24.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)