FLORA OF VIETNAM Orchidaceae Eria siamensis Schltr.
Son La Prov., Moc Chau Distr., Chieng Son comm., Pha Luong village, Pha Luong Mountains.
Primary evergreen broad-leaved and mixed forest with Pinus cernua on mountain tops and steep summit slopes composed with highly eroded red-brown sandstone at elevation 1400-1500 m a.s.l. around point 20°41′33.2N 104°37′37.0E.
Lithophyte on mossy exposed rocks. Flower buds white. Very common.