Vietnam, Nghe An Prov., Tuong Duong Distr., Tam Quang Municipality, Tung Huong village, along Khe Mat stream around point 19°03′15″N 104°36′19″ at elevation about 500-560 m a.s.l.
Lowland closed secondary and primary old evergreen forest on steep slopes along rocky limestone ridge and on rocky tops composed with solid limestone.
Woody vine up to 30 m long. Not rare.
HLF 6718 18 March 2007.
Coll. Averyanov L., P.K.Loc, N.V.Trai, N.T.Vinh, N.D.Phuong, Averyanova A. Grant from Henry Luce Foundation.