N.Vietnam, Bac Kan Prov., Cho Don Distr., Ban Thi Municipality, village Phia Khao, around point 22º15'52''N, 105º32'01''E at elevation 800-900 m a.s.l. (Po Luong mountain). Primary broad-leaved evergreen closed forest on very steep slopes and cliffs near tops of rocky ridge composed with solid marble-like stratified limestone.
Terrestrial herb tuberiferous herb with corall-like rhizome (like Corallorhiza or Epipogium aphyllum). Flower buds dull pink-violet. Very rare.