N.Vietnam, Ha Tinh Prov., Huong Son Distr., Son Hong Municipality, around point 18°34′06′'N, 105°11′40′'E. Primary broad-leaved dry closed evergreen forest on very steep mt slopes of Khe Sinh stream canyon and along ridge composed with shale at elev. 800-1100 m a.s.l. near Laotian border.
Tree 25-30(35) m tall. Flowers white, anthers yellow. Very common. Co-dominant of the first forest stratum at 900-1100 m a.s.l.