23. Streptanthus insignis Jepson, Man. Fl. Pl. Calif. 420. 1925.
Herbs, annual, hirsute-hispid throughout. Stems 1.2–6 dm, simple or branched above. Basal leaves not rosulate, short petiolate, lanceolate to oblanceolate, 2–8 cm, coarsely dentate to pinnatifid; middle cauline leaves lanceolate, 1.3–9 x 0.2–2 cm, dentate, sessile, auriculate; upper leaves smaller, dentate. Racemes ebracteate, lax, with a terminal cluster of dark purple or greenish yellow sterile flowers; fruiting pedicels divaricate to ascending, straight or curved upwards or downwards, 3–8 mm. Flowers: fertile sepals forming campanulate calyx, dark purple, purplish, or greenish yellow, hirsute-hispid, oblong to lanceolate, 4–6 mm, not or slightly keeled; sterile sepals 8–14 mm, glabrous; petals purplish white, lemon-yellow, or yellowish white, with darker midvein, 7–12 mm; blade crisped, 2–4 x 1–2 mm, adaxial pair parallel and erect, abaxial pair spreading and reflexed; claw 5–8 mm, about as wide as blade; filaments in 3 pairs of unequal length; adaxial pair completely united, 6–9 mm; abaxial pair free, 4–6 mm; lateral pair 3–4 mm; anthers of adaxial stamens sterile, 0.2–0.7 mm; anthers of abaxial and lateral stamens fertile, 1.3–2 mm. Fruits 3.5–11.4 cm x 1.5–2 mm, flattened, ascending or reflexed, straight or slightly curved, not torulose; valves sparsely to densely hispid with trichomes to 1.7 mm, with a prominent midvein; gynophore 0.4–1 mm; replum straight; style 1–2 mm; stigma entire; ovules and seeds 32–94 per fruit. Seeds broadly oblong, 1.4–2 x 1–1.3 mm; wing continuous, 0.15–0.3 mm wide.
Habitat: steep scree or talus slopes of serpentine or Franciscan formation, openings in chaparral, oak woodlands.
Elevation: 200–1100 m.
Distribution: United States (SC California).