N.Vietnam, Ha Tinh Prov., Huong Son Distr., Son Hong Municipality, around point 18º34'06''N, 105º11'40''E. Primary broad-leaved evergreen forest on steep mt slopes composed with granite along Khe Van stream at elev 400-450 m a.s.l. Terrestrial creeping herb on shady rocky stream slope. Leaves uniform deep green. Locally common.