FLORA OF VIETNAM Orchidaceae Juss. Paphiopedilum hangianum H.Perner & O.Gruss
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 wet forest on very steep limestone slopes of highly eroded remnant limestone ridge at elev. 700-750 m a.s.l. Lithophyte herb on vertical limestone cliffs of N exposition. Rare due to hard total overcollecting. In the past locally very common.