Delphinium datum subsp. elatum

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1964, Flora Europaea - Volume 1. Lycopodiaceae to Platanaceae, Cambridge University Press : 214

(a) Subsp. elatum ( D. intermedium A iton; inch D. alpinum Waldst. & Kit. , D. tiroliense Kerner and? D. cryophilum Nevski ): Perianth-segments (without spur) (11)14-19(22) mm. Spur usually distinctly longer than perianth-segments. 2« = 32. Au Cz He Ju Po Rm Rs (N, C, W).