Pedicularis sylvatica subsp. sylvatica

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 : 273

(a) Subsp. sylvatica :

Stems glabrous or with 2 lines of hairs, the central one up to 15 cm. Calyx and pedicels glabrous. 2n= 16. • Throughout the range o f the species except Portugal.