Annuals; glabrous throughout . Stems unbranched or branched distally, 0.2-2 dm. Basal leaves (soon withered); not rosulate; shortly petiolate; blade (fleshy), broadly obovate to suborbicular, 1.5-4 cm, margins coarsely dentate. Cauline leaves: blade ovate to oblong, 0.5-1.8 cm × 1-7 mm, (much smaller distally), base auriculate to amplexicaul, margins entire. Racemes ebracteate, (lax, sometimes secund). Fruiting pedicels divaricate-ascending, (straight), 1-2 mm. Flowers: calyx urceolate; sepals (erect), green, (ovate-lanceolate), 5-7 mm, keeled, (apex recurved); petals white, 6.5-8 mm, blade 1.5-2 × ca. 1.5 mm, margins not crisped, claw 5-6 mm, about as wide as blade; stamens in 3 unequal pairs; filaments: abaxial pair (connate 1/2 their length), 3-4 mm, lateral pair 1.5-2.5 mm, adaxial pair (connate their whole length, usually recurved), 6-8 mm; anthers: abaxial and lateral pairs fertile, 1.5-2 mm, adaxial pairs sterile, ca. 0.7 mm; gynophore 0.2-0.5 mm. Fruits divaricate-ascending, torulose, straight, flattened, 3-5 cm × 1.5-2 mm; valves each with obscure midvein; replum constricted between seeds; ovules 16-20 per ovary; style 0.1-0.2 mm; stigma entire. Seeds oblong, 1.6-2 × 1-1.2 mm; wing 0.1-0.2 mm wide, distal.
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