Centaurea rupestris subsp. rupestris

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 : 265

(a) Subsp. rupestris :

Stems erect, simple. Capitula longpedunculate. Appendages long-fimbriate, the apical fimbria stouter or replaced by a spine 5-20 mm. Italy, W. Jugoslavia.