Dien Bien Prov., Muong Cha Distr., Hua Ngai Municipality, Thien Pa Village, around point 21°52′27”N 103°09′45”E.
Highly degraded primary evergreen broadleaved humid forest on very steep slopes of remnant mountains composed with solid limestone at elevation 1100-1300 m a.s.l.
Herb to 0.5 m tall in open grassy place along road. Flowers blue. Common.
CPC 2070 08 April 2011 Coll.: L.Averyanov, P.K.Loc, N.Q.Hieu, N.T.Vinh.