Centaurea (Solstitiaria), (Hill) Dobrocz

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

Subgen. Solstitiaria (Hill) Dobrocz . (Sect. Mesocentron Hayek ). Annual to perennial. Leaves usually decurrent; lower lobed to pinnatifid; upper entire to dentate. Appendages not or shortly decurrent at base, palmately spiny at apex, the apical spine usually much longer than the others. Pappus usually present.