Verbascum nigrum subsp. nigrum

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 : 216

(a) Subsp. nigrum :

Basal leaves 15-30x 5-15 cm, with petiole 5-15 cm. Inflorescence simple or rarely with a few erect branches. Throughout the range o f the species except S. part o f Balkan peninsula.