S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, N slope of Bach Ma mt system, to the N-NW of point 16°12′11′'N 107°50′23′'E at elev. about 400 m a.s.l.
Broad-leaved evergreen wet primary closed forest on very steep sandstone, shale and granite slopes along rocky stream canyon. Creeping lithophytic and epiphytic vine in shady place along river. Common.
HLF 1478 30 April 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.