Herbs, perennial, 1.5–3 dm, appressed-silvery-silky; with woody, branching root crown. Cotyledons deciduous, petio­late. Stems decumbent, ascend­ing, or erect, clustered, usually unbranched. Leaves cauline; stip­ules 7–14 mm; petiole 2–5 cm; leaflets 6 or 7, blades 20–50 × 4–8 mm, adaxial surface hairs silvery-silky. Peduncles (1–)2–4(–5) cm; bracts 3–4 mm. Racemes dense, 3–7 cm; flowers ± whorled. Pedicels 2–5 mm. Flowers 11–13 mm; calyx 6–7 mm, bulge or spur 0–1 mm, abaxial lobe 3-toothed, adaxial lobe 2-toothed; corolla blue to lilac, banner patch yellow, banner well reflexed-recurved at or proximal to midpoint, this 3.5–6 mm proximal to apex, banner broader than long, hairy abaxially, lower keel margins glabrous, adaxial margin ciliate. Legumes 2.5–4 cm, silky. Seeds 4–5, mottled brown, 3–4 mm.

Phenology: Flowering Jun–Sep.
Habitat: Gravelly summits, red fir, subalpine forests.
Elevation: 1500–3500 m.

Distribution

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Calif., Nev.

Discussion

Lupinus obtusilobus is known in California from the North Coast Ranges, Klamath Ranges, Cascade Ranges, and northern Sierra Nevada (south to Nevada County), and in the Carson Range in eastern California and western Nevada.

Selected References

None.

Lower Taxa

None.