Centaurea aristata subsp. geresensis

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 : 276

(c) Subsp. geresensis (J. Arènes) Dostál , loc. cit. (1976)

( C. paniculata subsp. geresensis J. Arènes ):

Involucre 6-9 mm in diameter, more or less rounded at base; entire part of appendages broadly triangular, as long as wide, the apical spine 0-8-1 mm, the fimbriae 1-1-2 mm. Pappus 1-1-5 mm. N. Portugal (Serra do Gerez).