N.Vietnam, Thanh Hoa Prov., Ba Thuoc Distr., Co Lung Municipality, Eo Dieu village, around point 20°25′34′'N, 105°14′41′'E. Primary evergreen seasonal broad-leaved closed lowland forest on crystalline marble-like highly eroded limestone, very steep rocky slopes and cliffs of S exposition at elev. 450-600 m. Creeping lithophyte and epiphyte. Very common.