Rorippa amphibia, (L.) Besser

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 : 283

2. R. amphibia (L.) Besser , op. cit. 27 (1822)

( Nasturtium amphibium (L.) R.Br. ).

Perennial 40-120 cm, often stoloniferous, usually glabrous. Lower leaves shortly petiolate, very variable in shape, entire, toothed or pinnatifid, sometimes pectinate; the upper sessile, lanceolate, usually without auricles, entire or irregularly toothed. Petals about twice as long as sepals. Silicula 3-6 x 1-3 mm, ovoid, straight; pedicels 6-17 mm, horizontal or deflexed; style 1-2 mm. 2n = 16, 32. Wet places. Most o f Europe except the extreme north, but rare in the Mediterranean region. All except Al Az BI Cr Fa Is Sa Sb.