7. Streptanthus breweri A. Gray, Proc. Calif. Acad. Sci. 3: 101. 1864; Pleiocardia breweri (A. Gray) Greene, Leafl. Bot. Observ. Crit. 1: 86. 1904. TYPE: United States, California, [Stanislaus Co.], Diablo Mt., towards head of Arroyo del Puerto Cañon, 3200 ft., [13 June 1962], W. H. Brewer 1268 (lectotype here designated, GH!; isolectotypes, CAS!, MO!, NY!).
Herbs, annual, glaucous green, glabrous throughout except sometimes for sepals. Stems (0.5–)1.5–6.5(–8) dm, simple or branched about base. Basal leaves not rosulate, short petiolate, soon withered, broadly ovate to obovate, 1.5–4 cm, entire to coarsely dentate; middle cauline leaves ovate, 1.5–10 x 0.3–4.5 cm, sessile, amplexicaul, not overlapping; upper leaves narrowly lanceolate, much reduced, entire. Racemes ebracteate, without a terminal cluster of sterile flowers, sometimes secund, rachis straight; fruiting pedicels divaricate-ascending to suberect, 1.5–5(–6) mm. Flowers: sepals forming urceolate calyx, purple or white, ribbed, ovate, 5–7 mm, keeled, erect, glabrous or puberulent, apex recurved; petals recurved, white with purple veins or adaxial pair white, 8–12 mm, not crisped; blade 2–5 x 1–2 mm; claw 5–7 mm, about as wide as blade; filaments in 3 pairs of unequal length; adaxial pair united, recurved or not, 7–10 mm; abaxial pair united below, 5–6 mm; lateral pair 3–4 mm; anthers of adaxial stamens sterile, 0.6–1.3 mm; anthers of abaxial and lateral stamens fertile, 2–3 mm. Fruits 3–9 cm x 1–1.5 mm, erect to ascending, slightly flattened, strongly arcuate recurved or rarely straight; valves glabrous, with obscure midvein; gynophore 0.2–0.5 mm; replum straight; style 0.2–0.5 mm; stigma entire; ovules and seeds 24–54 per fruit. Seeds broadly oblong, 1–1.5 x 0.7–1 mm, flattened; wing absent or distal and ca. 0.1 mm wide. 2n = 28.
Habitat: serpentine barrens in chaparral, oak and pine woodlands.
Elevation: 300–2100 m.
Distribution: United States (California).