Hoa Binh Prov., Lac Son Distr., Tu Do Municipality, Mon village, around point 20°25’29”N 105°19’36”E. Primary broadleaved forest on steep rocky slopes of remnant mountain composed with solid crystalline highly eroded limestone at elevation about 500-700 m a.s.l. Terrestrial herb in shady place. Not rare. 25 March 2011CPC 1566b/sp.9. Coll.: L.Averyanov, L.Osinovetz, T.Maisak et al.