28. Streptanthus oliganthus Rollins, Contr. Dudley Herb. 3: 372. 1946. United States, California, Mono Co.: rocky slope, 2 mi. NW of Masonic, N of Masonic Peak, 8100 ft., 3 Aug 1945, Ira L. Wiggins & Reed C. Rollins 535 (holotype, DS!; isotypes, 2GH!, NY!, UC!).
Streptanthus cordatus var. exiguus Jepson, Fl. Calif. 2: 29. 1936. TYPE: United States, California, Sonora Pass, 10,000 ft., 16 Jul 1863, W. H. Brewer 1885 (holotype, UC!; isotypes, CAS!, GH!, MO!).
Herbs, perennial, glabrous throughout except for petioles of basal leaves, glaucous; caudex simple or few branched. Stems 1.5–4(–5) dm, simple or rarely few branched. Basal leaves rosulate, with wingless or rarely narrowly winged, setose-ciliate petioles, narrowly oblanceolate to lanceolate, 4–10 cm, entire; middle cauline leaves oblong-lanceolate, 2.5–8 x 0.5–1.6(–2.5) cm, sessile, auriculate, entire, obtuse to acute at apex, not overlapping; upper leaves smaller in size, reduced. Racemes ebracteate, lax, without a terminal cluster of sterile flowers; fruiting pedicels divaricate-ascending, straight, 3–10 mm. Flowers: sepals forming campanulate calyx, purple, broadly oblong, 5–8 mm, not keeled, glabrous; petals maroon-purple, 9–12 mm; blade 2–4 x 0.7–1 mm, not crisped; claw purplish, 6–8 mm, wider than blade; filaments in 3 pairs of unequal length, free; adaxial pair 7–9 mm; abaxial pair 5–7 mm; lateral pair 3–5 mm; anthers 2.5–4 mm. Fruits 4.5–9.7(–10.5) cm x 2–2.7(–3) mm, ascending to divaricate-ascending, flattened, straight, not torulose; valves glabrous, with a distinct midvein; gynophore 0.5–1 mm; replum straight; style 0.1–1 mm; stigma entire; ovules and seeds (42–)48–60 per fruit. Seeds oblong, 2–2.5(–2.7) x 1.5–2 mm; wing continuous, 0.2–0.4 mm wide.
Habitat: dry open pinyon woodland, pine forest, rocky subalpine forests, sagebrush.
Elevation: 2000–3050 m.
Distribution: United States (California/Mono Co., Nevada).