N.Vietnam, Ha Tinh Prov., Huong Son Distr., Son Kim Municipality, Rao Bun stream around point 18°23′39′'N, 105°15′12′'E. Primary and secondary broad-leaved evergreen closed wet forest on very steep shale slopes of river canyon at elevation about 300-350 m a.s.l. Woody vine 15-20 m long. Fruits brownish-green. Not common.