Thlaspi alpinum subsp. alpinum

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 : 321

(a) Subsp. alpinum :

Branches of stock long, stolon-like. Rosette-leaves ovate to suborbicular, often violet beneath; cauline leaves oblong, obtuse. Style 2 mm. E. & C. Alps.