Annual erect or spreading ± pilose herb up to 30 cm. tall, with rather stout taproot; main stem and branches ± quadrangular in section; branches at very wide angle to stem, terminating in lax racemes. Basal lvs up to 10 cm. long, on petioles ± 1 cm. long, ± ovate-oblong in outline, sublyrately pinnate to pinnatisect. Pinnae up to 1·5 cm. long, coarsely dentate-serrate; terminal lflts up to 2.5 cm. long, ovate to narrow- ovate, acute to acuminate; lowest lflts minute. Cauline lvs similar, smaller, us. ∞.Racemes up to 5 cm. long at anthesis, elongating to ± 10 cm. in fr. Fls small, rather distant, subopp. to alt. on slender sub- patent petioles ± 5 mm. long. Sepals 1·5-2 mm. long; petals obovate- spathulate, 1·5-2 mm. long. Median honey glands developed. Siliques or silicles ellipsoid, ± 5-7 × 2 mm.; valves convex; styles stiff, hardly 1 mm. long, stigma hardly wider. Seeds many, ± oval in outline, very finely papillose, c. 0·5 mm. diam., reddish brown.

n = 16

Perennial, rarely annual, taprooted herb. Stems erect, rarely decumbent, glabrous or hairy, (3)-20-40-(100) cm tall. Lvs glabrous or hairy; margins toothed. Rosette lvs petiolate, auriculate at base, deeply pinnatifid to pinnate, (2)-4-7-(10) × 1-3 cm. Stem lvs similar to rosette lvs, auriculate at base, becoming smaller with narrower lobes above, the uppermost sometimes simple. Pedicels glabrous or sparsely hispid, erecto-patent at flowering, spreading at fruiting, (2)-4-7 mm long. Sepals 1.5-2-(2.5) mm long. Petals yellow, = sepals. Silicle glabrous, oblong to elliptic, curved, (2)-4-7 × 2-3 mm; valves not veined; style 0.5-1 mm long. Seeds pale brown, c. 0.8 mm long, finely colliculate, in 2 rows per locule.