FLORA OF LAOS Orchidaceae Luisia zollingeri Rchb.f.
Houphan Prov., Viengxay Distr., Xieng Luong village, around point 20°22′06.1′'N 104°17′18.6′'E.
Primary and secondary broad-leaved evergreen dry forest on very steep rocky slopes of highly eroded mountains composed by solid marble-like limestone at elev. 600-700 m a.s.l.
Epiphyte on small trees on mountain top. Flowers odorless, sepals and petals olive-yellowish, lip dirty-violet. Common.