N. Vietnam, Hoa Binh prov., Mai Chau distr., Hang Kia municipality, near Hang Kia village (20°43′39′'N, 104°53′43′'E). Primary broad-leaved evergreen wet forest on slopes of remnant limestone highly eroded ridge at elev. 1100-1200 m a.s.l. Terrestrial and lithophyte herb up to 1 m hg on steep wet rocky slope. Flowers light greenish Common.