S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, Bach Ma mt, Hai Vong Dai peak, around point 16°11′65′'N 107°51′53′'E at elev. about 1350-1400 m a.s.l.
Mixed and broad-leaved evergreen primary closed mt forest on steep granite slopes. Creeping epiphytic vine in shady steep slope. Flowers white. Common. HLF 1123 20 April 2003.
Coll. N.T.Hiep, N.N.Thin, V.X.Phuong, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.