Thanh Hoa Prov., Thuong Xuan Distr., Van Xuan Municipality, Hang Cao village, Xuan Lien Natural Reserve. Remnants of primary and secondary broad-leaved evergreen forest on highly eroded rocky limestone hills at elevation 100-200 m a.s.l. around point 19°50′47.2″N 105°14′42.7″E. Lithophyte on shady mossy rocks on shady, very steep, rocky slope. Not rare. 8 November 2013 CPC 6935a Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, N.D.Thang, L.D.Qui Flowered in 16 March 2017. Flowers orange. Flowered in 28 March 2018. Flowers orange.