Thlaspi praecox subsp. praecox

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 : 320

(a) Subsp. praecox :

Rosette-leaves oblong to broadly ovate; cauline leaves ovate. Style (1—)2—3-5 mm. Throughout the range o f the species.