Laserpitium siler subsp. siler

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1981, Flora Europaea. Volume 2. Rosaceae to Umbelliferae, Cambridge University Press : 369

(a) Subsp. siler :

Lower leaves 4-pinnate; lobes 5-12 mm wide, lanceolate, acute, shortly stalked, the 3 terminal free at base. Throughout the range of the species except the south-east.