Biennial or perennating herb, 30-60 cm tall, erect, robust, appressedly canescent with 2-3 (-4)-partite hairs. Basal leaves rosulate, oblong-elliptic or oblanceolate, 5-10 cm long, 4-7 mm broad, stalked, often sparsely dentate, acute; upper leaves similar, gradually becoming smaller above. Racemes 30-40-flowered, up to 20 cm long in fruit. Flowers c. 12 mm across, yellow, lower 1 or 2 flowers sometimes bracteate; pedicels up to 9 mm long in fruit, slightly thickened, spreading. Sepals 5-6 mm long. Petals 10-12 mm long, 3-3.5 mm broad. Stamens c. 6:8 mm long; anthers c. 2.5 mm long. Siliquae 30-50 mm long, 2.5 mm broad, appressedly hairy; style c. 1 mm long, thickened, with capitate, large, sub-bilobed stigma; septum slightly rigid; seeds c. 1.5 mm long, oblong.