Annuals; (sometimes glaucous), glabrous throughout. Stems unbranched or branched distally, (0.8-)2-8(-10) dm. Basal leaves (soon withered); rosulate; petiolate; blade 1-or 2-pinnatifid (with broadly linear to filiform lobes), 2-20 cm, margins sinuate-dentate. Cauline leaves: blade linear, 1-10 cm × 1-3 mm, (smaller distally), base auriculate, margins entire. Racemes ebracteate, (lax). Fruiting pedicels strongly recurved, 2-5 mm. Flowers (markedly zygomorphic); calyx urceolate; sepals greenish yellow or purplish, (abaxial broadly ovate, not keeled, 4-6 × 3-4 mm, lateral ovate-lanceolate, keeled, 4-6 × 1.5-2 mm, adaxial suborbicular to broadly ovate-cordate, forming a bannerlike hood, keeled, 4-6 × 6-8 mm); petals white (with brownish veins), 5-8 mm, blade 1-3 × 0.7-1.2 mm, margins crisped (channeled), claw 4-5 mm, wider than blade; stamens in 3 unequal pairs; filaments: abaxial pair (distinct), 4-5 mm, lateral pair 3-4 mm, adaxial pair (connate), 5-6 mm; anthers: abaxial and lateral pairs fertile, 1.5-2 mm, adaxial pairs sterile, 0.3-0.7 mm; gynophore 0.1-0.4 mm. Fruits pendent, smooth, straight, flattened, 2.4-5.6 cm × 1.2-1.7 mm; valves each with obscure or somewhat prominent midvein; replum straight; ovules (10-)18-50 per ovary; style 0.8-2 mm; stigma entire. Seeds oblong, 1.7-2 × 0.9-1.1 mm; wing 0.2-0.3 mm wide, distal. 2n = 28.
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