Brassica tournefortii

Annual, sometimes detaching near ground level at maturity and dispersing as a tumbleweed. Taproot long. Stems erect, to 90 cm high, herbaceous, branched, bristly at base to glabrous above. Basal leaves petiolate, with 4–10 pairs of irregularly-toothed lateral lobes, densely bristly underneath; upper leaves becoming sessile and bract-like towards apex of plant. Inflorescence initially with open flowers overtopping or equalling the buds, elongating with age. Sepals erect, 3–4 mm long; petals 5–8 mm long, pale yellow fading to white; stamens erect; ovary sessile. Fruit erect, 3–7 cm long (including beak), 2–3 mm wide; valves constricted between seeds, midrib not prominent; beak 8–20 mm long, with 1 or 2 seeds; pedicel 10–25 mm long; seeds c.2 mm wide, reddish-brown. Flowers Apr.–Oct.