FLORA OF VIETNAM Orchidaceae Oberonia ensiformis (J.E.Smith) Lindl.
Vietnam, Lang Son Prov., Bac Son Distr., Tan Tri Municipality, around Na Mau village.
Highly degraded primary and secondary broad-leaved evergreen forest on very steep slopes and along tops of ridge composed with solid highly eroded crystalline gray marble-like limestone at elevation about 500-600 m a.s.l.
Lithophytic herb on vertical shady cliff near top of ridge. Not common.