Northern Vietnam, Lao Cai Prov., Van Ban Distr., Khanh Yen Ha municipality, to the SW of Na Nheo village (in the vicinity of point 21°58′39′'N, 104°14′35′'E). Primary closed evergreen broad-leaved submontane forest on steep granite and quartzite slopes at elev. 800-1200 m a.s.l. Terrestrial herb on steep slope. Flowers greenish. Very common at elev. 1200-1400 m a.s.l.