Quang Binh Prov., Minh Hoa Distr., Thuong Hoa municipality, environs of Mo O O O village, around point 17°39′31.7”N 105°54′48.2”E.
Primary broad-leaved closed forest on very steep rocky slope of remnant mountain composed with highly eroded solid crystalline limestone at elevation 400-500 m a.s.l.
Lithophytic herb on rocky very steep slope. Flowers white, anthers yellow. Common.
CPC 3655 23 July 2011 Coll.: N.T.Hiep, L.Averyanov, N.S.Khang, N.Q.Vinh.