FLORA OF VIETNAM Orchidaceae Paphiopedilum hangianum Perner & Gruss N.Vietnam, Bac Kan Prov., Cho Don Distr., Ban Thi Municipality, village Phia Khao, Lung Li valley, around point 22°16′10′'N, 105°31′01′'E, Cot Moc mountain at elevation 800-900 m a.s.l.
Primary broad-leaved evergreen closed forest on very steep slopes and cliffs near tops of rocky ridge composed with solid marble-like stratified limestone.
Lithophytic rosette herb on wet travertine deposits on large shady vertical cliff of W exposition at elevation about 850 m a.s.l. Flowers fragrant of typical coloration. Not common.