Thua Thien – Hue Prov., Nam Dong Distr., Thuong Lo Municipality, along Cha Mang stream, around point 16°06′26″N 107°44′40″E.
Remnants of primary evergreen broad-leaved lowland forest on very steep hill slopes composed with stratified shale and sandstone at elev. 100-150 m a.s.l.
Terrestrial herb up to 1.5 m tall on steep shady rocky stream slope. Flowers white. Locally very common.
HAL 11009 8 Apr. 2007. Photo. Coll.: L.Averyanov, Phan Ke Loc, A.Averyanova, N.D.Phuong, L.V.Hung.