Annual, 15-60 (-90) cm tall, branched below, ± hispid rarely glabrous. Lower leaves loosely rosulate, petiolate, ovate-oblong or lyrate-pinnatifid, 2.5-12(-20) cm long. 1-5 cm broad; lobes, short, obtuse, obscurely 2-3 toothed; upper leaves few, sessile or subsessile, oblong-elliptic or linear, 1-3 cm long, 0.3-1 cm broad, entire or obscurely toothed. Racemes 10-60-flowered, corymbose, becoming lax and up to 45 cm long in fruit. Flowers large, 10-15 mm across, cream-violet or pinkish; pedicel 7-20 mm long, increasing up to 25 mm in fruit, filiform, spreading. Sepals 6-8 mm long, 1.2-2 mm broad, oblong ± hairy. Petals 10-15 mm long, 4.5-6 mm broad, obovate clawed. (claw about as long as limb), apex subemarginate. Stamens 6-7:8-9 mm long; anthers 2-2.5 mm long. Siliquae oblong-linear, (20-) 30-40 (-60) mm long, 1.5-2 (-2.5) mm broad, compressed; gynophore usually 1 mm long; valves with a distinct mid-vein, thin; beak c. 1 mm long with a large bilobed stigma; septum hyaline, not veined; seeds indefinite, biseriate, c. 1 mm long, ovoid, pale brown.