N.Vietnam, Ha Tinh Prov., Huong Son Distr., Son Kim Municipality, Rao Bun stream around Rao An FPD station at 18°25′18′'N, 105°13′15′'E. Primary and secondary broad-leaved evergreen closed wet forest on very steep shale slopes of river canyon at elevation about 200-300 m a.s.l.
Treelet 4-5 m tall up to 15 cm in diam. Flowers white with yellow-green tint. Common.