N.Vietnam, Cao Bang Prov., Trung Khanh Distr., Ngoc Khe Municipality, Pac Nga village, around point 22°54′59′'N, 106°31′44′'E, at elevation 700-800 m a.s.l.
Remnants of primary broad-leaved evergreen and coniferous forest along tops of rocky ridges and mesae composed with light gray solid marble-like highly eroded crystalline limestone.
Tree 8-12 m tall, 25-35 cm in diam. Rare due to logging. Former co-dominant of primary coniferous forest, that presently extinct.