Biennial herb. Stem erect, sparsely hairy at base, becoming glabrous above, 40-70 cm tall. Lvs thin, glabrous above, with scattered hairs on veins beneath. Rosette and lower stem lvs reniform to ovate, cordate, obtuse to subacute, sinuate-dentate, (1.5)-3-8 × (2)-3.5-8 cm; petiole c. 2× length of lamina. Stem lvs similar, becoming triangular, truncate, coarsely dentate; petiole < lamina. Racemes 10-30 cm long at fruiting. Pedicels c. 5 mm long, slender at flowering, stout at fruiting. Sepals glabrous, ovate, 2-3 mm long. Petals white, 3-4.5 mm long. Siliques glabrous, spreading or slightly ascending, linear-cylindric, weakly torulose, (25)-35-50 × 1.5 mm; style 0.5 mm long. Seeds brown, finely longitudinally striate, 3-3.5 mm long.