Herbs, perennial, 2–3 dm, green, silky; rhizomatous, from slender underground rootstock. Cotyledons deciduous, petiolate. Stems short-decumbent, clustered, unbranched. Leaves cauline, clustered near base; stip­ules 8–10 mm; petiole (5–)8–13 cm; leaflets 5–9, blades oblanceolate, 15–50 × 4–10 mm, abaxial surface silky-hairy, adaxial surface glabrous. Peduncles 4–8 cm; bracts deciduous, 3–4 mm. Racemes 5–15 cm; flowers not whorled. Pedicels 3–5 mm. Flowers 8–11 mm; calyx bulge or spur 0–1 mm, abaxial lobe entire, 3.5–6 mm, adaxial lobe 2-toothed, 2–5 mm; corolla violet, banner glabrous abaxially, lower keel margins glabrous, adaxial margin ciliate. Legumes 3–4.5 cm, hairy. Seeds 5 or 6, brown, 6–7 mm.

Phenology: Flowering Apr–Sep.
Habitat: Dry banks, yellow pine forests, serpentine soils.
Elevation: 500–2000 m.

Distribution

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Calif., Oreg.

Discussion

Lupinus onustus is known in California from the southern Cascade Range, Klamath Ranges, and north­ern Sierra Nevada, to the Siskiyou Mountains of south­western Oregon.

Selected References

None.

Lower Taxa

None.