Tuyen Quang Prov., Na Hang Distr., Sinh Long Municipality, Khuoi Phin village, around point 22°38′21.9″N, 105°20′43.5″E.
Primary evergreen mixed humid forest on rocky limestone on highly eroded karstic hills composed with gray solid marble-like limestone at elevation 1100-1200 m a.s.l.
Lithophytic herb with ascending stems to 40 cm long on mossy rocky shady slope. Leaves green with dirty purple-violet spots, flowers yellowish, lip white with light brownish-purple spots. Occasional.