Vietnam, Thua Thien – Hue Prov., Nam Dong Distr., Huong Son Municipality, around point 16°09'52''N, 107°36'22''E. Heavily logged primary closed broad-leaved evergreen lowland forest along La Ma River on very steep hill slopes composed with clayey shale at elevation about 300 m a.s.l. Epiphyte on mossy trees along stream. Flowers dull red. Not common.