Centaurea aristata subsp. exilis

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

(a) Subsp. exilis (J. Arènes) Dostál , Bot. Jour. Linn. Soc. 71: 199 (1976)

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

Involucre 4-7 mm in diameter, narrowed at base; entire part of appendages broadly triangular, wider than long, the apical spine 1-1-5 mm, the fimbriae 1 - 5 mm. E.C. Portugal (Monfortinho).