Thanh Hoa Prov., Thuong Xuan Distr., Bat Mot Municipality, Duc village, Xuan Lien Natural Reserve. Primary broad-leaved evergreen forest along narrow ridge composed by shale at elevation 850-1150 m a.s.l. around point 20°01’50.4’’N 104°57’21.0’’E. Terrestrial creeping herb in shady places along ridge edge. Leaves gray-green with dark gray spots above, dull purple-violet below. Rare.