N.Vietnam, Bac Kan Prov., Cho Don Distr., Ban Thi Municipality, village Phia Khao, around point 22°16′58′'N, 105°31′20′'E at elevation 800-900 m a.s.l. (Lung Chang and Lung Li mountains).
Remnants of primary broad-leaved evergreen closed wet forest on very steep slopes and cliffs of rocky ridges and mesae composed with solid marble-like stratified limestone.
Terrestrial and lithophytic herb on very steep shady rocky slopes and cliffs. Flowers white with deep purple spots inside tepals. Leaves very deep green with white median stripe. Very common.