Dien Bien Prov., Tua Chua Distr., Tua Thang Municipality, De Chu village, around point 21°53′22”N 103°24′56”E.
Primary evergreen broadleaved forest on very steep slopes and on tops of remnant mountains composed with solid limestone at elevation 900-1150 m a.s.l.
Lithophytic herb on shady vertical cliffs. Flowers purple. Occasional.
CPC 2248 12 April 2011 Coll.: L.Averyanov, P.K.Loc, N.Q.Hieu, N.T.Vinh.