Annuals; (glaucous), usually glabrous throughout (sometimes stem bases pubescent). Stems unbranched or branched distally, 1.7-10.6 dm, (trichomes 0.05-0.5 mm). Basal leaves (soon withered); rosulate; petiolate; blade similar to cauline. Cauline leaves: blade broadly ovate to broadly oblong or lanceolate, 2-15 cm × 10-80 mm, (smaller distally), base amplexicaul, margins entire, (apex acute to acuminate or rounded). Racemes ebracteate, (dense or lax). Fruiting pedicels divaricate-ascending, (straight), 4-7 mm. Flowers: calyx campanulate; sepals (erect), purplish, 4-9 mm, (lateral pair rarely with subapical callus, 0.1-0.3 mm), not keeled; petals (widely spreading to somewhat reflexed), magenta (with deep purple center), 11-21 mm, blade 6-12 × 5-11 mm, margins not crisped, claw 5-10 mm, narrower than blade; stamens tetradynamous; filaments: median pairs (distinct), 5-7 mm, lateral pair 3-5 mm; anthers (all) fertile, 3-4 mm; gynophore 0.7-1.5 mm. Fruits ascending, smooth, straight, flattened, 6-11.4 cm × 2-3 mm; valves each with prominent midvein; replum straight; ovules 56-92 per ovary; style 1-2.5 mm; stigma strongly 2-lobed. Seeds broadly oblong, 2-2.5 × 1-1.3 mm; wing 0.2-0.3 mm wide, continuous.
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