Biennial to perennial with lax rosette. Stems erect, glabrous or sparsely hairy below, to 1 m tall; older stems woody. Lvs glaucous, glabrous or sparsely bristly, petiolate. Rosette and lower stem lvs lyrate-pinnatifid to lyrate-pinnate, (4)-8-20 × (2)-3-8 cm; margins crenate to dentate; terminal lobe large, often 3-lobed; lateral lobes subacute or obtuse, in 2-4 pairs, the proximal deflexed. Stem lvs becoming simple, linear, entire, c. 30 × 2 mm. Racemes 12-35 cm long; open fls slightly overtopping buds. Sepals narrow-oblong, 4-5 × c. 1 mm. Petals yellow, 7-9 × 4-5 mm. Lateral stamens spreading. Silique terete, glabrous, linear-oblong, constricted between seeds, (15)-20-35 × 2-3 mm; gynophore 1-2 mm long; valves with prominent median and 4 weaker lateral veins; beak conic, 0-2-seeded, 3-5 mm long. Seeds red-brown, c. 1 mm diam.