Galeopsis

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 : 146

Subgen. Galeopsis . Vegetative parts and usually also bracteoles and calyx with rigid, yellowish hairs and glandular hairs, sometimes with appressed hairs; stem 4-angled, more or less swollen at the nodes.