Quang Binh Prov., Tuyen Hoa Distr., Lam Hoa municipality, Hung village, around point 17°56′10”N 105°49′15”E.
Highly degraded primary and secondary evergreen broadleaved forest on very steep rocky slopes of remnant limestone hills composed with highly eroded marble-like crystalline limestone at elev. 150-200 m a.s.l.
Terrestrial herb among rocks in shady humid depression between limestone hills. Flower buds violet. Occasional.