Annuals; sparsely to densely pubescent or glabrous. Stems (simple from base), unbranched or branched distally, 1.5-8.5 (-11) dm, (sparsely to densely hirsute basally, usually glabrous distally, rarely throughout). Basal leaves (withered by flowering); not rosulate; petiolate; blade similar to cauline. Cauline leaves: blade ovate to oblong or lanceolate, 1-9 cm × 5-30 mm, (smaller distally), base amplexicaul, margins usually entire, rarely shallowly dentate, (midvein abaxially glabrous or pubescent, surfaces glabrous distally). Racemes ebracteate, (dense to lax). Fruiting pedicels divaricate-ascending, (straight), 5-16 mm, (glabrous or pubescent). Flowers: calyx campanulate; sepals purplish, 4-7 mm, not keeled, (hirsute, trichomes 0.7-2 mm, both pairs with subapical callosities, 1-2.5 mm); petals purple (with dark purple center), 9-17(-20) mm, blade 5-10 × 5-7 mm, margins not crisped, claw 4-7 mm, narrower than blade; stamens tetradynamous; filaments: median pairs (distinct), 5-6 mm, lateral pair 3-4 mm; anthers (all) fertile, 1.5-2.8 mm; gynophore 1-1.5 mm. Fruits ascending to suberect, smooth, straight, flattened, 0.6-1.4 cm × 2-3 mm; valves each with prominent midvein; replum straight; ovules 54-86 per ovary; style 1-1.5 mm; stigma strongly 2-lobed. Seeds broadly oblong, 2-2.7 × 1-1.2 mm; wing 0.1-0.25 mm wide, continuous.
Home