N.Vietnam, Bac Kan Prov., Na Ri Distr., Liem Thuy Municipality, village Lung Vai, around point 21°57′18′'N, 106°06′12′'E, at elevation 500-700 m a.s.l.
Primary broad-leaved evergreen closed wet forest on very steep slopes and cliffs of rocky ridges and mesae composed with white solid marble-like crystalline limestone.
Lithophytic herb on shady vertical cliff. Lithophyte in crevices of vertical cliffs. Flowers: tepals white, red-purple outside, anthers and stigmata yellow. Leaves deep green-brown with light green nerves above, dull brown-violet with light green nerves below. Common.