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Streptanthus insignis

Streptanthus insignis Jeps.  
Family: Brassicaceae
Plumed Jewelflower
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  • FNA
  • Resources
Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
Annuals; hirsute-hispid through-out. Stems unbranched or branched distally, 1.2-6 dm. Basal leaves not rosulate; shortly petiolate; blade lanceolate to oblanceolate, 2-8 cm, margins coarsely dentate to pinnatifid. Cauline leaves: blade lanceolate, 1.3-9 cm × 2-20 mm, (smaller distally), base auriculate, margins dentate. Racemes ebracteate, (lax, with a terminal cluster of dark purple or greenish yellow sterile flowers). Fruiting pedicels divaricate to ascending, (straight, curved upward, or recurved), 3-8 mm. Flowers: calyx campanulate; sepals (of fertile flowers) dark purple, purplish, or greenish yellow, (oblong to lanceolate), 4-6 mm, (8-14 mm in sterile flowers), not or slightly keeled, (hirsute-hispid in fertile flowers, glabrous in sterile flowers); petals: (abaxial pair spreading and reflexed, adaxial pair parallel and erect), purplish white, lemon-yellow, or yellowish white (with darker midvein), 7-12 mm, blade 2-4 × 1-2 mm, margins crisped, claw 5-8 mm, about as wide as blade; stamens in 3 unequal pairs; filaments: abaxial pair (distinct), 4-6 mm, lateral pair 3-4 mm, adaxial pair (connate their entire length), 6-9 mm; anthers: abaxial and lateral pairs fertile, 1.3-2 mm, adaxial pairs sterile, 0.2-0.7 mm; gynophore 0.4-1 mm. Fruits ascending or reflexed, smooth, straight or slightly curved, flattened, 3.5-11.4 cm × 1.5-2 mm; valves each with prominent midvein, (glabrate or sparsely to densely hispid, trichomes to 1.7 mm); replum straight; ovules 32-94 per ovary; style 1-2 mm; stigma entire. Seeds broadly oblong, 1.4-2 × 1-1.3 mm; wing 0.15-0.3 mm wide, continuous.
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