N.Vietnam, Thanh Hoa Prov., Ba Thuoc Distr., Co Lung Municipality, Eo Dieu village, around point 20º26'06''N, 105º13'51''E. Primary evergreen seasonal broad-leaved closed submontane forest on top of rocky ridge composed with crystalline marble-like highly eroded limestone at elev. 900-1000 m. Epiphyte. Flowers white. Very common.