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′).
Woody vine about 10 m lg. Flowers brightly violet. Not rare. VH 4040 17.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)