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Annuals or biennials; (taproot slender or swollen); (glaucous), glabrous, glabrescent, or pubes-cent, (trichomes coarse). Stems branched distally, 3-13 dm. Basal leaves (rosulate when biennial); petiole (often winged), to 15 cm; blade lyrate-pinnatifid, ± pinnately lobed, 5-25(-40) cm × 20-70(-100) mm, lobes 0-6 each side, (smaller than terminal), surfaces (glaucous), glabrous or sparsely hairy when immature, glabrescent, or, rarely, pubescent. Cauline leaves (middle and distal) sessile; blade base auriculate or amplexicaul, (margins entire). Racemes not paniculately branched, (buds overtopping or equal to open flowers). Fruiting pedicels spreading to ascending (slender), 1-3 cm. Flowers: sepals (5-)6-10 × 1.5-2.5 mm; petals golden or creamy to pale yellow, broadly obovate, 10-16 × (5-)6-9(-10) mm, claw 5-9 mm, apex rounded; filaments (5-)7-10 mm; anthers 1.5-2.5 mm. Fruits spreading to ascending, smooth or slightly torulose, terete, (3.5-)5-10(-11) cm × (2.5-)3.5-5 mm; valvular segment with 12-20(-30) seeds per locule, (3-)4-8.5(-9.5) cm, terminal segment usually seedless, rarely 1 or 2-seeded (attenuate-conic, thin), (5-)9-16 mm. Seeds dark brown to black, light brown, or reddish, 1.8-2.7(-3) mm diam.; seed coat finely reticulate-alveolate, not mucilaginous when wetted. 2n = 38.
Annual or biennial herb with lax rosette. Stems erect or ascending, becoming subwoody below, glabrous, to 1.5 m tall. Lower lvs petiolate, lyrate-pinnatifid with 1-3 pairs of lateral lobes, glaucous, bristly, especially on veins, often ciliate, 10-30 × 5-15 cm. Upper lvs glaucous, becoming entire, sessile, amplexicaul, glabrous, narrow-triangular, entire or toothed, 2-10 × 1-2 cm. Racemes to 40 cm long; open fls slightly below level of buds. Sepals erecto-patent, (4)-5-7 × 1-2 mm. Petals bright to pale yellow, 10-12 × (4)-5-6 mm. Lateral stamens spreading. Silique terete, glabrous, narrowly oblong, slightly constricted between seeds, (50)-60-80 × 2-5 mm; gynophore 0; valves with pronounced median and weak lateral veins; beak tapering, seedless, 8-15 mm long. Seeds dark brown to blue-black, 1.5-2.5 mm diam.
A cabbage family herb. It is an annual plant. It grows 1.5 m tall. It usually has a strong taproot. The stem is erect. The leaves have blue-green colour. The lower leaves have leaf stalks. The leaf blade is 5-20 cm long. The veins have some bristles. The upper leaves clasp the stem. Its blade is oblong or sword shaped. The petals are pale yellow. The pod is 5-10 cm long and slightly 4 angled. There is a beak 5-20 mm long which does not have seeds. The seeds are 1.5-2.5 mm wide. They are blue-black.
Very similar to B. rapa but basal leaves glaucous, glabrous or very sparsely hispidulous especially along the nerves, open flowers not overtopping buds, sepals ascending, petals 10–18 mm. long.
