Centaurea alba subsp. heldreichii, (Halacsy) 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 : 289

(r) Subsp. heldreichii (Halácsy) Dostál , loc. cit. (1976)

( C. heldreichii Halácsy ):

Perennial. Stems 30-60 cm, caespitose, paniculately branched. Leaves appressed-white-tomentose; lower 2-pinnatisect, with linear-oblong segments. Involucre 13-20 mm in diameter, ovoid-globose; appendages up to 8 mm in diameter, covering bracts, orbicular, white, semi-pellucid, with large, triangular, brownish-black or black central spot, the margin wide, pellucid, denticulate-fimbriate, the apex mucronate. Florets pale purple. Achenes c. 4 mm; pappus as long as or somewhat longer than achene. Maritime rocks. • W. Greece (E. of Mesolongion).