15. Streptanthus farnsworthianus J. T. Howell, Leafl. W. Bot. 10: 182. 1965. TYPE: United States, California, Kern Co., high ridge at the head of Lumreau Creek, 5.5 mi. SE of Glennville, 4600 ft, 13 May 1965, Evalyn L. Farnsworth 477 (lectotype here designated, CAS!; isolectotypes, GH!, NY!). Howell (1965) cited the above collection and Farnsworth 182 (CAS, GH) as the types for flowering and fruiting material, respectively.
Herbs, annual, glabrous, glaucous, usually with a purplish cast. Stems 2–10 dm, erect, simple or branched above. Basal leaves rosulate, soon withered, petiolate, 2-pinnatifid or 2-pinnatisect, 3.5–15 cm; middle cauline leaves lanceolate, 3–16 x 1–4 cm, sessile, amplexicaul, dentate distally or entire; upper leaves smaller, entire. Racemes bracteate below or between lowermost 1 or 2 flowers, without a terminal cluster of sterile flowers; fruiting pedicels divaricate-ascending, straight, 4–15 mm. Flowers: sepals forming urceolate calyx, violet-purple, 6–10 mm, slightly keeled or not, recurved at apex; petals white with violet veins, 8–11 mm; blade 3–4 x 1.5–2 mm, undulate, reflexed at apex; claw 6–8 mm, about as wide as blade; filaments in 3 pairs of unequal length, free; adaxial pair 7–9 mm; abaxial pair 4–6 mm; lateral pair 3–4 mm; anthers of adaxial stamens partially fertile, 2.5–3 mm; anthers of abaxial and lateral stamens fertile, 3.5–5 mm. Fruits 6–12 cm x 1.7–2.5 mm, ascending, straight to slightly curved, flattened, not torulose; valves glabrous, with a distinct midvein; gynophore 1–2 mm; replum straight; style 0.1–1 mm; stigma slightly 2-lobed; ovules and seeds 60–100 per fruit. Seeds broadly ovate to suborbicular, 2–2.5 x 1.5–2 mm; wing on distal half, 0.1–0.3 mm wide. 2n = 28.
Habitat: sparsely vegetated rocky sites (fractured slate, metamorphic gravels, gruss deposits), oak-pine woodlands.
Elevation: 400–1400 m.
Distribution: United States (Calif.