FLORA OF VIETNAM Orchidaceae Juss. Acampe rigida (Buch.-Ham. ex J.E.Smith) P.F.Hunt
N. Vietnam, Thanh Hoa prov., Ba Thuoc distr., Co Lung municipality, territory of Pu Luong protected area, near Co Lung village (20°27′28′'N, 105°12′18′'E). Primary broad-leaved evergreen forest on tops of remnant highly eroded karst limestone ridge at elev. 550-600 m a.s.l. Lithophytic shrublet with shoots up to 1 m hg on vertical cliffs. Not rare.