Nghe An Prov., Ky Son Distr., Na Ngoi Municipality, eastern slopes of Phu Xai Lai Leng Mountain. Primary and secondary broad-leaved forest on steep mountain slopes composed of sandstone and gray shale at elevation 1300-2000 m a.s.l. around point 19°12’54’’N 104°12’01’’E. Terrestrial herb on decaiving timber. Rare.