S.Vietnam, Thua Thien Hue Prov., Xuan Loc Distr., Bach Ma National Park, N-NW slope of Dong Truoi ridge around point 16°14′40′'N 107°44′06′'E.
Dry broad-leaved evergreen secondary closed forest on very steep slope at elev. about 700 m a.s.l. Creeping epiphytic vine 10-15 m long. Inflorescence and flowers greenish-brown. Common.
HLF 1709 6 May 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.