S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, primary mixed and broad-leaved evergreen forest on N slopes of Bach Ma range around point 16°11′10′'N 107°50′18′'E at elev. 1100-1200 m a.s.l.
Herb vine 4-6 m long among shrubs in open cliff. Not common.
HLF 1335 26 April 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.