S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, N slope of Bach Ma mt system around point 16°13′53′'N 107°49′02′'E at elev. about 100 m a.s.l.
Broad-leaved evergreen wet secondary closed forest along rocky river valley and on river slopes. Herb vine 10-15 m long among open river rocks. Flowers bright yellow. Very common.
HLF 1531 2 May 2003. (Photo).
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.