FLORA OF LAOS Orchidaceae Callostylis rigida Blume
Luang Prabang prov., Pon Xay distr., Houay Man village, Phou Pak Sang Mountain, around point 19°59′03.8′'N 102°25′09.0′'E.
Degraded primary evergreen and semideciduous forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 1000-1150 m a.s.l. Epiphytic and lithophytic creeping vine to 2 m long on mossy rocky mountain tops. Flowers dull yellowish, lip dark violet. Not common.