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 500-700 m a.s.l.
Primary broad-leaved evergreen closed wet forest on very steep slopes and cliffs of rocky ridges and mesae composed with white solid marble-like crystalline limestone.
Tree 15-20 m tall on tops of ridge. Not common. Not common co-dominant of fragments of coniferous forests on tops of ridge.