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 forest on very steep slopes of remnant limestone highly eroded ridge at elev. 1000 m a.s.l. Tree about 15 m hg along road. Not common.