34. Streptanthus vernalis R. O’Donnell & R. Dolan, Madroño 52: 202. 2005. TYPE: United States, California, Lake Co., serpentine talus and gravel, less than 0.4 km NE of Three Peaks, between White Point and McGuire Peak, 610 m., 1 May 2004, Richard O’Donnell s.n. (holotype, JEPS!).
Herbs, annual, glabrous throughout. Stems 0.2–2 dm, simple or branched above. Basal leaves not rosulate, soon withered, shortly petiolate, broadly obovate to suborbicular, 1.5–4 cm, coarsely dentate, fleshy, not mottled; middle cauline leaves ovate to oblong, 5–18 x 1–7 mm, sessile, auriculate to amplexicaul, entire; upper leaves similar, much reduced. Racemes ebracteate, sometimes secund, lax, without a terminal cluster of sterile flowers; fruiting pedicels divaricate-ascending, straight, 1–2 mm. Flowers: sepals forming urceolate calyx, green, ovate-lanceolate, 5–7 mm, keeled, erect, apex recurved; petals white, 6.5–8 mm; blade 1.5–2 x ca. 1.5 mm, not crisped, without darker colored veins; claw 5–6 mm, about as wide as blade; filaments in 3 pairs of unequal length; adaxial pair completely united, usually recurved, 6–8 mm; abaxial pair united to middle, 3–4 mm; lateral pair 1.5–2.5 mm; anthers of adaxial stamens sterile, ca. 0.7 mm; anthers of abaxial and lateral stamens fertile, 1.5–2 mm. Fruits 3–5 cm x 1.5–2 mm, divaricate-ascending, flattened, straight, torulose; valves glabrous, with obscure midvein; gynophore 0.2–0.5 mm; replum constricted between seeds; style 0.1–0.2 mm; stigma entire; ovules and seeds 16–20 per fruit. Seeds oblong, 1.6–2 x 1–1.2 mm; wing distal, 0.1–0.2 mm wide.
Habitat: serpentine talus and gravel.
Elevation: ca. 600 m.
Distribution: United States (California/Lake Co.).