Thua Thien – Hue Prov., Nam Dong Distr., Thuong Lo Municipality, along Cha Mang stream, around point 16°07′46″N 107°44′24″E.
Remnants of primary evergreen broad-leaved lowland forest on very steep hill slopes and rocky river valley composed with stratified shale and sandstone at elev. about 50-70 m a.s.l.
Terrestrial herb up to 0.5 m tall on shady steep rocky slopes. Flowers white, lip light violet. Occasional.
HAL 10937 6 Apr. 2007. Photo. Coll.: L.Averyanov, Phan Ke Loc, A.Averyanova, N.D.Phuong, L.V.Hung.