Thua Thien – Hue Prov., Nam Dong Distr., Thuong Lo Municipality, along Cha Mang stream, around point 16°07′58″N 107°44′46″E.
Primary evergreen broad-leaved lowland forest on very steep hill slopes and along ridge composed with stratified shale and sandstone at elev. about 400-450 m a.s.l.
Climbing woody grass with stems up to 6 m long on very steep slope near ridge top. Very common.
HAL 10986 7 Apr. 2007. Coll.: L.Averyanov, Phan Ke Loc, A.Averyanova, N.D.Phuong, L.V.Hung.