FLORA OF VIETNAM Orchidaceae Coelogyne ovalis Lindl.
Dien Bien Prov., Muong Cha Distr., Mua Ngai Municipality, around point 21°52′19”N 103°10′01”E.
Remnants of primary evergreen broad-leaved forest on very steep rocky slopes and on tops of remnant mountain composed with highly eroded marble-like solid crystalline limestone at elevation 1150-1250 m a.s.l.
Creeping epiphyte and lithophyte on top of ridge. Tepals light dull yellowish, lip keels brownish-yellow. Common.