Thua Thien – Hue Prov., Nam Dong Distr., Thuong Lo Municipality, along Cha Mang stream, around point 16°07′35″N 107°44′53″E.
Remnants of primary evergreen broad-leaved lowland forest on very steep hill slopes composed with stratified shale and sandstone at elev. about 150 m a.s.l.
Woody climbing vine up to 20 m long on very steep rocky shady slope. Flowers white. Common.
HAL 10824 4 Apr. 2007. Coll.: L.Averyanov, Phan Ke Loc, A.Averyanova, N.T.Vinh, N.D.Phuong, L.V.Hung.