FLORA OF VIETNAM Orchidaceae Porpax elwesii (Rchb.f.) Rolfe
Dien Bien Prov., Tua Chua Distr., Sin Chai Municipality, around point 22°03′38”N 103°19′56”E.
Primary humid 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 1350-1500 m a.s.l.
Epiphyte on mossy tree on top or ridge. Flowers dull red to dull red-brownish. Rare.