Vietnam, Nghe An Prov., Tuong Duong Distr., Tam Quang Municipality, near Tung Huong village, around point 19°05′23″N 104°39′59″E at elevation about 124 m a.s.l.
Lowland open secondary evergreen forest on steep slopes along rocky stream valley composed with stratified solid shale and solid sandstone.
Semi-woody vine 6-8 m long 0n steep stream slopes. Young inflorescences green. Occasional.
HLF 6557 14 March 2007.
Coll. Averyanov L., P.K.Loc, N.V.Trai, N.T.Vinh, N.D.Phuong, Averyanova A. Grant from Henry Luce Foundation.