Streptanthus bernardinus

(Greene) Parish
Pl. World 20: 216. 1917.
Basionym: Agianthus bernardinus Greene Leafl. Bot. Observ. Crit. 1: 228. 1906
Synonyms: Agianthus jacobaeus Greene Streptanthus campestris var. bernardinus (Greene) I. M. Johnston Streptanthus campestris var. jacobaeus (Greene) Jepson
Treatment appears in FNA Volume 7. Treatment on page 705. Mentioned on page 703.

Perennials; (caudex woody, often elevated); (glaucous), glabrous, (petioles and sepal apices pubescent). Stems unbranched or branched (few), 2.5–8.6 dm. Basal leaves not rosulate; petiolate (petioles ciliate); blade oblanceolate to spatulate, 2–8 cm (7–-25 mm wide), margins remotely dentate apically. Cauline leaves: blade ovate to lanceolate, 2–10 cm × 5–28 mm (smaller distally), base amplexicaul, margins entire, (apex acute to acuminate). Racemes ebracteate, (lax in bud). Fruiting pedicels divaricate-ascending, (straight), 4–7.5 mm. Flowers: calyx campanulate; sepals (ascending), pale yellow to white, (broadly oblong to ovate) 5–9 mm, not keeled; petals white, 7–11 mm, blade 2–4 × 1–1.3 mm, margins not crisped, claw 6–9 mm, wider than blade; stamens nearly tetradynamous; filaments: median pairs (distinct), 6.5–8.5 mm, lateral pair 4.5–5.5 mm; anthers (all) fertile, 3.5–4.5 mm; gynophore 0.5–1.5 mm. Fruits ascending to spreading, smooth, straight or curved, flattened, 5–12.7 cm × 1.5–3 mm; valves each with obscure midvein (at least distally); replum straight; ovules 36–56 per ovary; style 0.8–2.5 mm; stigma subentire. Seeds oblong, 2–3 × 1.4–2 mm; wing 0.1–0.2 mm wide at apex. 2n = 28.


Phenology: Flowering Jun–Aug.
Habitat: Dry open pine or cypress woods, chaparral
Elevation: 1200-2500 m

Distribution

V7 1214-distribution-map.gif

Calif., Mexico (Baja California).

Discussion

Streptanthus bernardinus is known from San Bernardino and San Diego counties; in Baja California it is restricted to Sierra Juárez and Sierra San Pedro Mártir.

The chromosome number 2n = 14, reported by R. C. Rollins (1993) and by R. E. Buck et al. (1993), must be an error for n = 14. No other species of Streptanthus or its immediate generic relatives has such a low number.

Selected References

None.

Lower Taxa

None.

... more about "Streptanthus bernardinus"
Ihsan A. Al-Shehbaz +
(Greene) Parish +
Agianthus bernardinus +
Calif. +  and Mexico (Baja California). +
1200-2500 m +
Dry open pine or cypress woods, chaparral +
Flowering Jun–Aug. +
Agianthus jacobaeus +, Streptanthus campestris var. bernardinus +  and Streptanthus campestris var. jacobaeus +
Streptanthus bernardinus +
Streptanthus +
species +