Annual to perennial. Hairs stiff, simple, recurved. Stem ± stout, often much-branched, densely hairy below, becoming glabrous above, 30-70-(100) cm tall. Lvs all densely hairy, petiolate. Rosette lvs crowded, 4-10-(30) × 1.5-3-(6) cm; terminal leaflet ovate to oblong, rarely ± triangular, often with 1-2 rounded lobes at base; lateral lobes oblong to triangular, ± auriculate at base; margins irregularly bluntly serrate to crenate. Stem lvs few, smaller than rosette lvs and with fewer leaflets, bluntly serrate, the uppermost simple, narrow-oblanceolate. Racemes many, obliquely spreading, 30-50 cm tall. Pedicels erect, swollen and narrowly clavate at fruiting, 4-8 mm long. Sepals 2-3 × 0.5-1 mm, oblanceolate. Petals pale yellow, often with dark veins; claw narrow, c. (⅓) as long as limb. Silique glabrous, erect, 6-10 × 1-2 mm; valves 4-6 mm long, 3-veined when immature but veins obscure when mature; beak swollen, 2-4 mm long, (0)-1-(2)-seeded. Seeds c. 1 mm long, (1)-3-5 per locule.