Dien Bien Prov., Muong Cha Distr., Mua Ngai Municipality, around point 21°52′19”N 103°10′01”E.
Remnants of primary evergreen broad-leaved forest on very steep rocky slopes and on tops of remnant mountain composed with highly eroded marble-like solid crystalline limestone at elevation 1150-1250 m a.s.l.
Terrestrial and lithophytic herb on steep shady rocky slope. Flowers dark dirty purple, stigma light green. Not common.
CPC 1079 18 December 2010 Coll.: L.Averyanov, P.K.Loc, P.V.The, N.T.Vinh.