N. Vietnam, Hoa Binh prov., Mai Chau distr., Hang Kia municipality, between Hang Kia and Po Co villages (20°43′39′'N, 104°53′43′'E). Primary broad-leaved evergreen wet forest on very steep slopes of remnant limestone highly eroded ridge at elev. 1100 m a.s.l. Creeping epiphyte vine with pendent shoots on old tree in shady place. Not common.