Quang Binh Prov., Tuyen Hoa Distr., Lam Hoa municipality, Hung village, around point 17°55′41”N 105°49′43”E.
Secondary shrubs along small river on flat alluvial valley between remnant limestone hills composed with highly eroded marble-like crystalline limestone at elev. About 100 m a.s.l.
Terrestrial herb along shady river slopes. Flowers dark brownish-violet. Common.