Annuals; (glaucous), usually glabrous throughout (some-times sepals pubescent). Stems branched distal to base, 1-7.5 dm. Basal leaves (soon withered); not rosulate; petiolate; blade narrowly ovate to oblong, 2.5-5 cm, margins entire. Cauline leaves: blade linear to narrowly linear-lanceolate, 2-12 cm × 1-3(-4) mm, (smaller distally), base auriculate, margins entire. Racemes ebracteate, (lax, usually secund). Fruiting pedicels divaricate, (straight), 1-3(-6) mm. Flowers: calyx urceolate; sepals greenish to purplish, ovate-lanceolate, 6-8 mm, keeled, (apex recurved, usually glabrous, rarely sparsely pubescent); petals white (abaxial pair with purple veins), 8-12 mm, blade 3-5 × 2-3 mm, (unequal, abaxial longer than adaxial), margins not crisped, claw 5-7 mm, narrower than blade; stamens in 3 unequal pairs; filaments: abaxial pair (connate 1/2 their length), 4-7 mm, lateral pair 2-4 mm, adaxial pair (connate their whole length, recurved), 7-11 mm; anthers: abaxial and lateral pairs fertile, 2-2.7 mm, adaxial pairs sterile, 0.5-1.2 mm; gynophore 0.2-0.5 mm. Fruits divaricate, slightly torulose, recurved, flattened, 3.5-6.5 cm × 1-1.2 mm; valves each with obscure midvein; replum straight; ovules 28-40 per ovary; style 0.1-0.3 mm; stigma entire. Seeds narrowly oblong, 1-1.5 × 0.6-0.8 mm; wing 0-0.1 mm wide, distal.
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