N.Vietnam, Bac Kan Prov., Cho Don Distr., Ban Thi Municipality,village Phia Khao, around point 22°17′31′'N, 105°31′51′'E, Cau Muc mountain at elevation 800-900 m a.s.l. Primary broad-leaved evergreen closed forest on very steep slopes and cliffs near tops of rocky ridge composed with solid marble-like stratified limestone. Lithophytic shrub 2-2.5 m tall on vertical cliff. Fruits green with purple tint. Common. HAL 4862 24 May 2004