FLORA OF VIETNAM Orchidaceae Panisea tricallosa Rolfe
Dien Bien Prov., Tua Chua Distr., Sin Chai Municipality, around point 22°03′38”N 103°18′56”E.
Remnants of primary humid evergreen broad-leaved forest on very steep slope of remnant hill composed with highly eroded marble-like solid crystalline limestone at elevation about 1250 m a.s.l.
Epiphyte on mossy tree near top of ridge. Flowers white, lip with 2 yellow spots. Not common.