S.Vietnam, Thua Thien Hue Prov., Phu Loc Distr., Bach Ma National Park, N slope of Bach Ma mt, below Hai Vong Dai peak, Khe Su, around point 16°11′65′'N 107°51′53′'E at elev. 800-900 m a.s.l.
Broad-leaved evergreen secondary closed mt forest on steep shale/granite slopes along road. Herb vine 10-14 m long in open place. Not common.
HLF 1354 26 April 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.