Vietnam, Nghe An Prov., Tuong Duong Distr., Tam Quang Municipality, Tung Huong village, along Khe Mat stream around point 19°03′09″N 104°36′53″E at elevation about 300-350 m a.s.l.
Lowland open secondary evergreen forest on steep slopes along rocky river valley composed with stratified solid shale and sandstone.
Woody vine 3-5 m long in rather open place. Flower buds whitish-green. Not common.
HLF 6907 22 March 2007.
Coll. Averyanov L., P.K.Loc, N.V.Trai, N.T.Vinh, N.D.Phuong, Averyanova A. Grant from Henry Luce Foundation.