Lychnis flos-cuculi subsp. flos-cuculi

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 : 157

(a) Subsp. flos-cuculi :

Petal-limb deeply 4-lobed with linear, patent lobes, usually pale purplish. In = 24. Throughout the range o f the species.