N. Vietnam, Hoa Binh prov., Da Bac distr., near Doan Ket village (20°54′58′'N, 105°03′51′'E). Primary broad-leaved evergreen wet forest on steep slopes of remnant highly eroded limestone ridge at elev. 600 m a.s.l., White Rock mt. (Nui Da Trang). Parasitic shrub with shoots up to 1.5 m in open place. Flowers dull yellow-orange. Rare.