Centaurea margaritacea subsp. margaritalba

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 : 286

(d) Subsp. margaritalba (Klokov) Dostál, loc. cit. (1976)

( C. margaritalba Klokov ):

Stems scabrid above. Segments of cauline leaves linear-filiform. Involucre 15-20 mm in diameter, globose; appendages 6-8 x 8-10 mm, covering the yellow bracts, membranous, white, not pellucid, not keeled, with triangular, reddishbrown central spot, the margin denticulate, the apex convolute, muticous. Florets purple. Achenes 3-5-4 mm, blackish, with white ribs; pappus somewhat shorter than to as long as achene. Submaritime sands. • S. Ukraine ( E. side ofestuary of R. Bug).