Orobanche 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 : 291

(a) Subsp. amethystea

(inch O. attica Reuter ):

Calyx-segments 1- veined, filiform above. Corolla often inflected near base, more or less straight above, usually tinged with violet; upper lip deeply 2-lobed. Stigma purple or yellow. Usually on species of Eryn- gium , Daucus, Ballota and Compositae. Throughout the range of the species.