Quang Binh Prov., Tuyen Hoa Distr., Lam Hoa municipality, Hung village, around point 17°55′41”N 105°49′43”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. 200-300 m a.s.l. Lithophytic and epiphytic creeping herb on steep rocky slope. Locally common. CPC 2609f 1 May 2011 Coll.: L.Averyanov, P.K.Loc, N.Q.Hieu, P.V.The, N.T.Vinh.
Fl. in cultivation it 24 July 2013. Flowers dark violet, apical half of lateral sepals light dull dirty-violet to whitish-violet. Averyanov L.