Annuals; (glaucous), usually glabrous, (sometimes sepals pubescent). Stems unbranched or branched basally, (0.5-) 1.5-6.5(-8) dm. Basal leaves (soon withered); not rosulate; shortly petiolate; blade broadly ovate to obovate, 1.5-4 cm, margins entire or coarsely dentate. Cauline leaves: blade ovate or (distally) narrowly lanceolate, 1.5-10 cm × 3-45 mm, (much smaller distally), base amplexicaul, margins entire. Racemes ebracteate, (sometimes secund, rachis straight). Fruiting pedicels divaricate-ascending to suberect, 1.5-5 (-6) mm. Flowers: calyx urceolate; sepals (erect), purple or white, (ovate), 5-7 mm, keeled, (ribbed, apex recurved); petals (recurved), white (with purple veins or adaxial pair white), 8-12 mm, blade 2-5 × 1-2 mm, margins not crisped, claw 5-7 mm, about as wide as blade; stamens in 3 unequal pairs; filaments: abaxial pair (connate proximally), 5-6 mm, lateral pair 3-4 mm, adaxial pair (connate, recurved or not), 7-10 mm; anthers: abaxial and lateral pairs fertile, 2-3 mm, adaxial pair sterile, 0.6-1.3 mm; gynophore 0.2-0.5 mm. Fruits erect to ascending or recurved, usually strongly arcuate, rarely straight, slightly flattened, 3-9 cm × 1-1.5 mm; valves each with obscure midvein; replum straight; ovules 24-54 per ovary; style 0.2-0.5 mm; stigma entire. Seeds broadly oblong, 1-1.5 × 0.7-1 mm; wing (0-)0.1 mm wide distally. 2n = 28.
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