Digitalis purpurea subsp. heywoodii, P. & M. Silva

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 : 240

(c) Subsp. heywoodii P. & M. Silva , Agron. Lusit. 20:239 (1959):

While plant densely white-lanate. Lower leaves ovate-lanceolate to lanceolate, tapered into the petiole or contracted at base. Pedicels equalling or longer than calyx. Corolla white, sometimes partly pale pink or pale yellowish, sparsely hairy outside. 2« = 56. Granite rocks. • S'. Portugal (around Reguengos de Monsaraz).