FLORA OF LAOS Orchidaceae Panisea tricallosa Rolfe Xiangkhouang Prov., Peak Distr., Khoang village, Pa Khao mt., around point 19°33′02.2′N 103°39′56.3′E.
Primary and secondary broad-leaved evergreen dry forest on solid rocky highly eroded limestone at elev. 1200-1450 m a.s.l.
Lithophytic herb on vertical shady mossy cliff. Locally very common.