Annuals. Stems simple from base, erect, branched (few to several) distally, 0.2-0.8(-1.5) dm. Basal leaves not rosulate (representing cotyledons); petiole 0.2-0.6 cm; blade spatulate to oblong, 0.8-1.6 cm × 3-5 mm, base cuneate, margins entire, apex obtuse. Cauline leaves sessile; blade 0.5-1.7(-2) cm × 3-5(-7) mm, base obtuse (not auriculate), margins usually entire, rarely repand, apex obtuse. Racemes 3-7(-15)-flowered, (slightly elongated in fruit). Fruiting pedicels ascending to erect, 3.5-8(-12) mm. Flowers: sepals oblong, 1.8-2.2 × 0.7-1 mm; petals spatulate, (3-) 4-6 × 1.5-2.5 mm; filaments 1.5-2 mm; anthers 0.3-0.4 mm. Fruits (crowded) elliptic to oblong, 8-12 × 3.5-4.5 mm, angustiseptate, (obtuse at both ends); valves not reticulate; septum complete; ovules 10-14 per ovary; style 0.2-0.5 mm. Seeds light brown, ovoid-oblong, 1.1-1.3 × 0.9-1 mm, coarsely papillate.
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