Achillea distans subsp. distans

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 162

(a) Subsp. distans ( A. dentifera DC. ): Leaf-segments separated by a sinus, the rhachis dentate. Ligules 1—2-5(—3) mm, white, rarely pink. 2/7 = 54. Almost throughout the range of the species.