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 800-850 m a.s.l.
Remnants of primary broad-leaved evergreen and coniferous forest along rocky tops of rocky ridges and mesae composed with light gray solid marble-like highly eroded crystalline limestone.
Tree 4-8 m tall and 20 cm in diam. Remnant single trees along tops of ridge. Not common. Former co-dominant of primary coniferous forest.