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.