Erect, densely lealy, generally unbranched biennial herbs up to 1 m or more tall; rarely branched in the upper part. Stem densely retrorsely hairy near the base, glabrous above. Basal leaves in a rosette, often dying off early, oblanceolate, narrowed into a petiole, sharply dentate or repand-dentate, 5-10 cm long, both surfaces scabnd with branched hairs, the midrib of the petiole on both surfaces with a mixture of branched and simple hairs. Stems leaves sessile, sagittate, amplexicual, oblong-lanceolate, acute, entire, glabrous, glaucous, erect and overlapping, the lower ones up to 10 cm long, upwards gradually smaller. Flowers small, the petals 4-6 mm long, oblanceolate. Fruiting raceme elongate up to 60 cm long with 4-12 mm long erect-appressed pedicels. Siliquae 4-8 cm long 1-2-1-8 mm broad, erect, linear, straight; valves 1-nerved, smooth; style very short. Seeds c. 1 mm long, compressed.
