Vietnam, Quang Tri Prov., Huong Hoa Distr., Huong Viet Municipality, to N of Sa Mui pass, around point 16є51’14’’N 106є34’13’’E at elevation 550-650 m a.s.l. Remnants of primary broad-leaved evergreen lowland forest on rocky remnant highly eroded solid marble-like limestone hills and low mountains with very steep slopes and vertical cliffs. Lithophytic rosulate herb on vertical shady cliff. Very common.