Vietnam, Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Municipality, about 1-1.5 km to SW of Ban On village (17є40'21''N, 105є58'00''E). Ca Xach mountain (17є39'20''N, 105є57'42''E).Primary closed evergreen broad-leaved gnarled stunted forest along rocky ridge composed with solid marble-like highly eroded crystalline limestone at elevation 600-800 m a.s.l. Tree 5-6 m tall and about 25 cm in diam. on tops of ridge. Occasional.