Centaurea solstitialis subsp. erythracantha, (Halacsy) Dostal

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 284

(d) Subsp. erythracantha (Halácsy) Dostál , loc. cit. (1976)

( C. erythracantha Halácsy ):

Like subsp. (c) but upper leaves narrowly linear; appendages of bracts with reddish-brown apical spine. • E. Greece (Litokhoron, E. of Olimbos).