Dien Bien Prov., Tua Chua Distr., Tua Thang Municipality, Ta Xi Lang village, around point 21°57′17”N 103°25′31”E.
Highly degraded primary and secondary evergreen broadleaved forest on very steep slopes and on tops of remnant mountains composed with solid limestone at elevation 850-950 m a.s.l.
Lithophytic herb to 1 m tall on shady mossy rocks. Flowers green. Locally common.
CPC 2283 13 April 2011 Coll.: L.Averyanov, P.K.Loc, N.Q.Hieu, N.T.Vinh.