Centaurea seridis subsp. maritima, (Dufour) 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 : 283

(c) Subsp. maritima (Dufour) Dostál , loc. cit. (1976)

(C. maritima Dufour ):

Leaves dentate, mucronate; lower lyratepinnatifid; upper auriculate-semiamplexicaul. Involucre c. 25 mm in diameter, ovoid; appendages ovate-lanceolate, strongly deflexed, the apical spines subequal. Maritime sands. S. & S.E. Spain.