Quang Binh Prov., Minh Hoa Distr., Thuong Hoa municipality, around point 17°41’14.3”N 105°53’28.9”E.
Primary evergreen broad-leaved mossy forest on tops and along ridge edge composed with solid crystalline limestone at elevation 700-750 m a.s.l. Terrestrial herb in shady depression between ridge tops. Flowers white. Common.