N.Vietnam, Bac Kan Prov., Na Ri Distr., Liem Thuy Municipality, village Lung Vai, around point 21°57′18′'N, 106°06′12′'E, at elevation 500-600 m a.s.l. Remnants of primary broad-leaved evergreen closed forest on steep shale slopes on foothill of rocky ridge composed with white solid marble-like crystalline limestone.
Tree about 2o m tall. Flowers dull green-green with deep dirty purple-brown base of tepals. Occasional.