Annuals; puberulent or hirsute. Stems simple or several from base, erect to ascending or (outer ones) decumbent, unbranched or branched, 0.2-1.5(-3.8) dm. Basal leaves (soon withered); not rosulate; petiole often undifferentiated (to 3 cm); blade linear, 2-10 cm × 1-4 mm, margins entire, dentate, or pinnatisect (lobes 2-10 pairs, margins entire or dentate). Cauline leaves similar to basal, smaller, blade base attenuate, not auriculate, margins entire. Racemes (subcapitate to cylindrical), elongated or not in fruit, (compact); rachis puberulent, trichomes straight, cylindrical. Fruiting pedicels erect to slightly ascending, straight and appressed to rachis or distally slightly recurved, (strongly flattened), 2.5-5 × 0.9-1.4 mm, usually puberulent throughout, rarely only adaxially. Flowers: sepals (somewhat persistent), ovate, 1.1-1.4 × 0.6-0.8 mm; petals greenish, obovate-oblong, 1.9-3 × 0.8-1.3 mm, claw absent, (usually pubescent outside, with fringed margin, rarely glabrescent); stamens 4, median; filaments 0.8-1.1 mm; anthers 0.15-0.2 mm. Fruits oblong-ovate, 5-7 × 2.8-4 mm, apically winged, apical notch 1.4-2.8 mm deep; valves thick, smooth, strongly reticulate-veined, hirsute and puberulent, (trichomes spreading, mixed with smaller ones); style obsolete, included in apical notch. Seeds oblong, 2-2.4 × 1.1-1.3 mm.
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