FLORA OF VIETNAM Tiliaceae Burettiodendron hsienmu
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 evergreen broad-leaved forest along tops of rocky ridges and mesae composed with light gray solid marble-like highly eroded crystalline limestone.
Tree 6-8 m tall (up to 30 m). Common. Former co-dominant of 1 forest stratum, particularly on slopes and valleys (presently all ripe samples totally logged).