N.Vietnam, Thanh Hoa Prov., Ba Thuoc Distr., Thanh Son Municipality, middle part of Pu Luong range, E slopes of Phu Pha Phong peak around point 20°28′32′'N, 105°05′35′'E. Primary evergreen seasonal broad-leaved closed submontane forest on basalt at elev. 1550-1600 m. Shrub. Occasional.