S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, vicinities Klong Lanh village, 31 km to NE from Dalat city. Old open evergreen broadleaved secondary forest rich in primary elements along mt river on NW macroslope of Bi Dup mt system at 1450 m alt. (N 12° 08′, E 108° 39′). Herb vine up to 4-6 m lg in open place. Flowers yellowish-green. Common. VH 4035 17.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)