Centaurea grisebachii subsp. grisebachii

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 : 274

(a) Subsp. grisebachii :

Stems 30-50 cm, branched at about the middle. Lower leaves with more than 5 pairs of segments. Involucre 6-7 mm in diameter; appendages with wide auricles. Throughout the range of the species.