Anemone trifolia subsp. trifolia

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 : 218

(a) Subsp. trifolia :

Perianth-segments ovate; anthers blue; head of achenes erect. Usually calcicole. Throughout the range of the species, except the Iberian peninsula.