S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, N slope of Bach Ma mt system, to the N of point 16°11′50′'N 107°50′44′'E at elev. 600-1000 m a.s.l.
Mixed and broad-leaved evergreen primary closed wet mt forest with Shorea stellata & Dacrycarpus imbricatus along narrow ridge and on very steep sandstone/shale slopes. Herb epiphytic vine on open waterfall cliff. Flowers white or light yellowish. Very common.
HLF 1404 28 April 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.