Nghe An Prov., Ky Son Distr., Na Ngoi Municipality, eastern slopes of Phu Xai Lai Leng Mountain. Primary very humid broad-leaved forest on steep mountain slopes composed of sandstone and gray shale at elevation about 2300 m a.s.l. around point 19°12’23.3’’N 104°11’33.7’’E. Lithophytic undershrub on mossy rocks. Common.