FLORA OF VIETNAM Orchidaceae Juss. Calanthe triplicata (Willem.) Ames
N. Vietnam, Tuyen Quang prov., Na Hang distr., Thanh Tuong municipality, near Ban Bung village (22°16′26′'N, 105°25′58′'E). Primary broad-leaved evergreen very dry forest (with Burettiodendron hsienmu as a main dominant) near top of limestone ridge at elev. about 600 m a.s.l. Lithophyte and terrestrial herb on very steep rocky slope composed with slaty stratified limestone. Common.