Vietnam, Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Municipality, around Ban On village (17°40'21''N, 105°58'00''E). Primary closed evergreen broad-leaved lowland forest on steep slopes and on tops of rocky ridge composed with solid marble-like highly eroded stratified crystalline limestone at elevation about 500-620 m a.s.l. Treelet 3-5 m tall. Fruits deep violet. Very common. Co-dominant of second forest stratum.