Quang Binh Prov., Tuyen Hoa Distr., Lam Hoa municipality, Chuoi village, around point 17°56′51”N 105°49′18”E.
Primary broadleaved evergreen dry forest on very steep slopes and on tops of rocky ridge composed with highly eroded crystalline limestone at elev. 200-250 m a.s.l.
Lithophytic herb to 1.5 m tall on vertical shady slopes. Median tepal white with red purple side lobes and red-purple stripes on median lobe, “column” dark red-purple. Not rare.