FLORA OF VIETNAM Gesneriaceae Ornithoboea wildeana W.G.Craib
Son La Prov., Moc Chau Distr., Chieng Son comm., about 1 km to NE from Chieng Son Village, around point 20°46′02.0N 104°37′03.1E.
Remnants of primary broad-leaved evergreen forest on tops of hills composed with karstic highly eroded yellow-white limestone at elevation 1150-1250 m a.s.l.
Lithophytic herb to 0.5 tall on mossy exposed rocks. Flowers light purple-violet. Not rare.