Hoa Binh Prov., Tan Lac Distr., Bac Son Comm., Hay Duoi Vill., Dinh Bang Mt., around point 20033′40″ N, 105007′20″ E, 908 m a.s.l., limestone mt. In logged primary closed evergreen broad-leaved submontane forests, ridge Herb annual
CPC 591 23 Oct 2010 Coll.: NQ Hieu, PK Loc, NT Vinh, NS Khang & BV Sinh