S. Vietnam, Prov. Ninh Thuan, distr. Ninh Son, municipalite Phuoc Binh, 37 km to NE from Dalat city. Closed primary broadleaved wet mt forest on E macroslope of Gia Rinh mt. ridge at 1700-1800 m alt. (N 12° 06′, E 108° 43′). Woody vine up to 3-4 m lg in open place. Not rare. VH 3525 02.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)