Thlaspi perfoliatum, L.

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 : 319

3. T. perfoliatum L. , Sp. Pl. 646 (1753).

Annual 5-20(-30) cm, glabrous, glaucous. Basal leaves rosulate, obovate, petiolate; upper cauline leaves ovate-cordate, sessile, with rounded, amplexicaul auricles; all entire or sinuate-denticulate. Sepals 1 -1-5 mm, with broad, white margins; petals 2-3 mm, white; stamens shorter than the petals; anthers yellow. Silicula 5-7 mm, broadly obcordate, convex beneath; wing broadening upwards; style c. 0- 3 mm, included within the wide and fairly deep notch. Seeds 3-4 in each loculus, almost smooth. 2n = 70. In open vegetation on limestone, loess and base-rich loams, and a weed of arable land and waste places. Europe northwards to c. 60° N. in Sweden. All except AzFa Fe Hb Is No Sb.