Pallenis spinosa subsp. spinosa

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 : 139

(a) Subsp. spinosa :

Stem equally hairy throughout, usually branched in upper i; branches erecto-patent. Disc of capitulum at anthesis 1 -5-2 cm across; ligules deep yellow. 2л = 10. Throughout the range of the species.