Cymbalaria muralis subsp. muralis

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 : 237

(a) Subsp. muralis :

Glabrous except sometimes for a few hairs on young leaves and stems. Pedicel at anthesis about equalling subtending petiole. Corolla violet. Capsule c. 4 mm, considerably exceeding calyx. Seeds coarsely rugose. Throughout the range o f the species except parts o f Sicilia.