Perennial, rarely biennial; taproot stout to swollen. Rosette lvs with terminal leaflet narrower than rest of lf, and 4-8 pairs of close-set lateral leaflets; distal leaflets much > proximal. Petals yellow or white, rarely pink or purple or brownish, 15-20 mm long. Silique (1)-2-6-seeded, not breaking readily into segments, (10)-20-40-(60) × (4)-6-8 mm; constrictions short, often deep; segments spherical or wider than long, weakly to strongly ribbed; final segment abruptly narrowed to apex; apex tapering, 1-2-(3)× length of final segment. Seed c. 3 mm long.