Linaria amethystea subsp. amethystea

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1972, Flora Europaea. Volume 3. Diapensiacea to Myoporaceae, Cambridge: Cambridge University Press : 236

(a) Subsp. amethystea

(incl. L. broussonetii (Poiret) Chav. ):

Corolla 10-22 mm, bluish-violet, rarely white or yellow with violet spur; spur 4-11 mm; racemes lax in fruit. Throughout the range o f the species.