Vietnam, Thua Thien – Hue Prov., A Luoi Distr., A Roang Municipality, Tra Lenh Forestry Department station, around point 16°04'41''N, 107°29'06''E. Primary closed evergreen broad-leaved forest on very steep mountain slopes composed with shale, sandstone and granite at elevation 700-800 m a.s.l. Lithophytic sedge on mossy cliffs along rocky stream valley. Not common.