N.Vietnam, Bac Kan Prov., Cho Don Distr., Ban Thi Municipality, village Phia Khao, around point 22є15'52''N, 105є32'01''E at elevation 800-900 m a.s.l. (Po Luong mountain). Primary broad-leaved evergreen closed forest on very steep slopes and
cliffs near and on tops of rocky ridge composed with solid marble-like stratified limestone. Tree up to 12 m tall on tops of ridge. Common.