Verbascum thapsus subsp. thapsus

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 : 211

(a) Subsp. thapsus :

Basal leaves shortly petiolate; lower cauline leaves long-decurrent. Corolla-lobes ovate. Filaments of lower stamens glabrous or sparsely hairy. Throughout the range of the species.