Plants winter annuals. Stems erect to ascending, (slender or stout), 1.5-6.5 dm. Basal leaves (soon withered), early rosulate; petiole 1-4 cm; blade margins 2-or 3-pinnatisect, 4-15 cm; lobes 8-16 on each side; apical segment oblong to ovate, 1-10(-12) × 0.5-2(-3.5) mm, margins entire. Cauline leaves (and bracts) similar to basal, smaller distally (lobes fewer). Fruiting pedicels: some from basal rosette (straight or slightly recurved), (30-)50-100 (-180) mm. Flowers: sepals (persistent), erect, oblong-lanceolate, 9-12(-15) × 2-3.5 mm, apex appendage well-developed, (1-)2-4 mm; petals broadly obovate, 12-15(-20) × (5-)7-11 mm, apex rounded; median filament pairs 4-6 mm, slightly dilated basally; anthers linear, 3-4 mm; gynophore usually obsolete, rarely to 2 mm. Fruits oblong, somewhat inflated, (0.8-)1-2(-2.5) cm × 5.5-7.5 mm, (fleshy green, thick, leathery), base and apex obtuse to subacute; valves (covered with well-developed vesicles), not veined; replum rounded; septum complete; ovules 16-44 per ovary; style 2-5(-7) mm, not flattened basally. Seeds 4-5 mm diam.; wing 1-1.5 mm. 2n = 24.
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