Annuals; hirsute or puberulent. Stems few to several from base, erect to ascending, unbranched, (0.5-)0.8-3 dm. Basal leaves (soon withered); not rosulate; petiole 1-4 cm; blade linear or pinnatisect, (2-)2.5-6.1(-7.2) cm × (0.5-)1-2 (-3) mm, (lobes linear to narrowly oblong), margins entire. Cauline leaves sessile; blade linear, 1.2-5.8 cm × 0.5-2(-3) mm, base attenuate, not auriculate, margins entire. Racemes elongated, (dense or lax) in fruit; rachis puberulent or hirsute, trichomes straight, cylindrical. Fruiting pedicels erect to slightly ascending, straight and appressed to rachis or distally slightly recurved, (strongly flattened), (2-)3-4.2 × 0.4-0.6 mm (width proximal to apex), puberulent throughout. Flowers: sepals oblong to ovate, 0.7-1.1 × 0.2-0.6 mm; petals absent; stamens 4, median; filaments 0.5-1 mm; anthers ca. 0.1 mm. Fruits ovate to ovate-oblong, (3-)4-6 × 2.5-3.5 mm, apically winged, apical notch (V-shaped), (0.8-)1-2 mm deep; valves thin, smooth, strongly reticulate-veined, usually glabrous, rarely pubescent; style absent or obsolete, included in apical notch. Seeds ovate, 1.3-2 × 0.8-1.2 mm.
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