Herbs, perennial, 2–6 dm, hairy, silver to dull green. Cotyledons deciduous, petiolate. Stems decumbent, ascending, or erect, unbranched or branched. Leaves cauline; stipules not leaflike, green to silvery, 5–17 mm; petiole 2–6 cm; leaflets 6–9, blades 20–50 × 3–7 mm, widest above middle, adaxial surface pubescent, appressed-hairy to ± silky or dull green. Peduncles 2–8 cm; bracts deciduous, 2–8 mm. Racemes 2–23 cm; flowers spirally arranged to subwhorled. Pedicels 2–6 mm. Flowers 9–12 mm; calyx bulge or spur 0–1 mm, abaxial lobe entire or minutely 3-toothed, 3–7 mm, adaxial lobe 2-toothed, 4–6.5 mm; corolla pale yellowish to lavender or violet, banner patch yellow to white, banner gla­brous abaxially, keel upcurved, glabrous, banner ovate, wings wide, covering keel tip. Legumes 2–4 cm, silky. Seeds 3–6, mottled brown, 4–6 mm. 2n = 48.

Phenology: Flowering May–Jul.
Habitat: Dry slopes, montane forests.
Elevation: 500–3500 m.

Distribution

• Generated Map
• Legacy Map

Calif., Oreg.

Discussion

Lupinus adsurgens is found in the San Francisco Bay region and North Coast Ranges of California, north to southern Oregon (Josephine County), and throughout the Sierra Nevada.

All parts of Lupinus adsurgens are toxic, causing crooked neck disease in cattle (A. M. Davis 1982).

Selected References

None.

Lower Taxa

None.