13. Streptanthus diversifolius S. Watson, Proc. Amer. Acad. Arts 17: 363. 1882; Mitophyllum diversifolium (S. Watson) Greene, Leafl. Bot. Observ. Crit. 1: 88. 1904. TYPE: United States, California, Consumne River, V. Rattan  (holotype, GH!; isotypes, CAS!, MO!).
Streptanthus linearis Greene, Pittonia 3: 225. 1897. TYPE: U.S.A. California: Mariposa Co., Pea Ridge rd., 25 Apr. 1895, J. W. Congdon s.n. (holotype, NDG!).
Herbs, annual, glabrous throughout, somewhat glaucous. Stems (1–)2–9(–10.5) dm, erect, branched above. Basal leaves not rosulate, petiolate, pinnatisect to pectinate into filiform segments, 2–8 cm; middle cauline leaves petiolate, not auriculate, 2–12 cm, pectinate or pinnatisect into filiform segments 0.4–2.7 cm x 0.5–1.5 mm; upper cauline leaves linear-lanceolate to ovate or cordate, sessile, amplexicaul, entire, becoming bracts. Racemes bracteate below or between lowermost 1 or 2 flowers, without a terminal cluster of sterile flowers; fruiting pedicels divaricate to divaricate-ascending, straight, 2–10 mm. Flowers: sepals forming urceolate calyx, yellow or purplish, 5–7 mm, keeled, recurved at apex; petals pale yellow to whitish with purple veins, recurved, 8–16 mm; blade 3–6 x 1.5–3.5 mm, undulate; claw 5–10 mm, narrower than blade; filaments in 3 pairs of unequal length, free; adaxial pair 4–8 mm; abaxial pair 2.5–6 mm; lateral pair 1.5–4 mm; anthers of adaxial stamens partially fertile, 1.5–2.3 mm; anthers of abaxial and lateral stamens fertile, 3.5–4 mm. Fruits 3–9 x 1–1.5(–2.2) mm, geniculately reflexed from gynophore, straight, flattened, not torulose; valves glabrous, with obscure midvein; gynophore 0.5–1.5 mm; replum straight; style 0.2–1 mm; stigma obscurely 2-lobed; ovules and seeds (22–)38–80 per fruit. Seeds oblong, 1–1.5(–2.2) x 0.6–1(–1.5) mm; wing absent or distal, 0.05–0.1(–0.4) mm wide. 2n = 28.
Habitat: dry rock outcrops, granitic domes, adjacent road cuts and disturbed areas; open oak woodlands.
Elevation: 200–1900 m.
Distribution: United States (California).