N. Vietnam, Hoa Binh prov., Da Bac distr., near Doan Ket village (20°54′58′'N, 105°03′51′'E). Secondary open broad-leaved evergreen forest along small river at elev. about 650 m a.s.l. Climbing shrub up to 3 m lg in open river slope. Flowers dull yellow. Common.