S. Vietnam, Prov. Ninh Thuan, distr. Ninh Son, municipalite Phuoc Binh and Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay boundary region in 34 km to NE from Dalat city. Closed primary broadleaved cloud very wet forest along Gia Rinh mt. ridge at 1800-1900 m alt. (N 12° 07′, E 108° 41′). Woody vine up to 10 m lg. Flowers white. Common. VH 3642 04.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)