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. 1100-1150 m a.s.l.
Broad-leaved evergreen primary closed mt forest with Shorea stellata on steep shale/granite slopes. Woody vine 4-6 m long. Common.
HLF 1188 20 April 2003.
Coll. N.T.Hiep et al. Grant from Henry Luce Foundation.