Annuals; glabrous, (sometimes sepals pubescent). Stems branched basally, (0.7-)1-6.7 (-8) dm. Basal leaves (soon withered); not rosulate; petiolate; blade oblanceolate or oblong to lanceolate, 2-5(-7) cm (5-15 mm wide), margins remotely dentate. Cauline leaves: blade linear to linear-lanceolate, (1.5-)3-9(-10) cm × 0.5-2 mm (smaller distally), base not auriculate, margins entire. Racemes ebracteate, (lax, often secund). Fruiting pedicels ascending to divaricate, 1-2.5(-4) mm. Flowers: calyx urceolate; sepals (erect), green to purplish, (ovate), 4-6 mm, slightly keeled, (apex recurved, glabrous or hirsute, trichomes retrorse); petals white (abaxial pair with purplish veins), 6-9 mm, blade 2-4 × 1.5-2.5 mm, margins not crisped, claw 4-6 mm, narrower than blade; stamens in 3 unequal pairs; filaments: abaxial pair (connate to middle), 4.5-5.5 mm, lateral pair 2.5-3.5 mm, adaxial pair (connate, strongly recurved, purplish), 7-9 mm; anthers: abaxial and lateral pairs fertile, 1.5-2.2 mm, adaxial pair sterile, 0.4-1 mm; gynophore 0.3-1 mm. Fruits divaricate-ascending to reflexed, slightly torulose, curved or, rarely, straight, slightly flattened, 2-6(-7) cm × 1.2-1.5 mm; valves each with obscure midvein; replum straight; ovules 22-38 per ovary; style 0.1-0.7 mm; stigma entire. Seeds narrowly oblong, 1.3-1.8 × 0.6-0.8 mm; wing (0-)0.1-0.25 mm wide distally, (narrower at margin or absent). 2n = 28.
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