Thua Thien – Hue Prov., Nam Dong Distr., Thuong Lo Municipality, Cha Mang river basin, around point 16°07′12″N 107°43′45″E.
Primary evergreen broad-leaved lowland forest on very steep hill slopes and along tops of ridge composed with stratified shale at elev. 500-600 m a.s.l.
Terrestrial herb 0.5-1 m tall on very steep rocky shady slope. Flowers white, leaves uniform green. Not common.