Centaurea stenolepis subsp. stenolepis

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 : 295

(a) Subsp. stenolepis (C. cetia (G. Beck) H. Wagner): Stems 70-100 cm. Leaves ovate-lanceolate, sparsely arachnoid-tomentose, membranous, the middle cauline narrowed or rounded at the base. Capitula solitary. Involucre (10-)12-14mm in diameter, shortly cylindrical; appendages pale yellow oryellowishbrown, shortly fimbriate, recurved. 2n = 22. Throughout the range of the species.