S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay,
36-38 km to NE from Dalat city. Closed primary dry evergreen broadleaved mt forest at 1550-1600 m alt. in 12-14 km from Bi Dup main peak to the NNW (N 12° 08′, E 108° 39′). Woody vine with milky juice about 6 m lg in open dry place. Flowers white. Not common. VH 3788 08.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)