Centaurea alba subsp. alba

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 : 288

(c) Subsp. alba (C. strepens Hoffmanns. & Link): Biennial. Stems 10-40 cm, corymbosely branched, with patent branches above the middle. Leaves lanate, greyish-green; lower pinnatipartite or 2-pinnatisect, with linear-lanceolate, sometimes mucronate-dentate segments. Involucre 12-15 mm wide, ovoidglobose; appendages covering bracts, white, pellucid, cuculiate, shining, entire, the apex emarginate, aristate. Florets pale purple. Achenes 2-5-3 mm; pappus as long as achene. • Spain, Italy,?France.