Nepeta tuberosa subsp. tuberosa

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 : 158

(a) Subsp. tuberosa :

Cauline leaves usually exceeding the internodes. Inflorescence with most verticillasters densely crowded. Bracts 10-12 mm, lanceolate, entire, reddish-purple, suberect. Calyx-teeth 2-5-3 x 0-5 mm, sublinear. Corolla 12- 13 mm, violet-blue. Throughout the range o f the species.