Annuals; glabrous or puber-ulent. Stems several from base, usually erect to ascending, rarely decumbent, branched, 0.4-1.5(-2) dm. Basal leaves (soon withered); not rosulate; petiole 0.5-1.5(-2) cm; blade margins entire or pinnatifid (lobes 2-5 pairs, linear to filiform), 1.5-5 cm × 0.5-2 mm. Cauline leaves petiolate; blade linear, 0.1-0.3 cm × 0.5-2 mm, base attenuate, not auriculate, margins entire. Racemes considerably elongated, (lax) in fruit; rachis glabrous or puberulent, trichomes straight, cylindrical. Fruiting pedicels divaricate to horizontal or descending, usually recurved, rarely straight, (terete or slightly flattened), 2-4(-6) × 0.2-0.3 mm, glabrous or puberulent adaxially. Flowers: sepals oblong, 0.6-0.8 × 0.4-0.5 mm; petals absent; stamens 4, median; filaments 0.6-0.7; anthers ca. 0.1 mm. Fruit ovate, 2.4-3.6 × 1.8-2.5 mm, apically winged, apical notch (V-shaped), 0.3-0.8 mm deep; valves thin, smooth, strongly reticulate-veined, glabrous; style obsolete or to 0.1 mm, included in apical notch. Seeds oblong, 1.4-1.8 × 0.8-0.9 mm.
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