Drypis spinosa subsp. spinosa

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 : 181

(a) Subsp. spinosa ( subsp. linneana Murb. & Wettst. ): Outer bracts lanceolate, with long terminal spine considerably exceeding flowers. Calyx membranous below. Limb of petal bifid to base; claw exceeding calyx. Mountain screesfrom 800-3000 m. Throughout the range o f the species, except N. W. Jugoslavia and N.E. Italy.