Ranunculus hyperboreus subsp. hyperboreus

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 : 233

(a) Subsp. hyperboreus :

Scarcely caespitose; leaf-lobes ovate, divaricate; head of achenes 4-5 mm in diameter. 2n = 32. Throughout the range o f the species.