FLORA OF VIETNAM Gentianaceae Phylocyclus lucidissima
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 500-600 m a.s.l.
Secondary broad-leaved evergreen closed shady forest on very steep slopes and cliffs of rocky ridges and mesae composed with light gray solid marble-like crystalline limestone.
Lithophytic herb up to 0.5 m tall on wet travertine deposits on high open vertical cliff of N exposition. Rare.