Centaurea margaritacea subsp. gerberi

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

(l) Subsp. gerberi (Steven) Dostál, loc. cit. (1976)

( C. gerberi Steven ):

Stems smooth above. Leaf-segments oblong. Involucre 11-16 x 9-14 mm, ovoid; appendages c. 6 mm in diameter, not covering bracts, orbicular, concolorous, pale yellow, shining, pellucid, indistinctly keeled, the margin subdenticulate, flat, the apex muticous. Florets pale yellow. Achenes 3-5-4-5 mm, blackish; pappus as long as achene. Sandy steppes. • S.E. Russia.