Herbs, perennial, 5–12 dm, green, glabrous or sparsely hairy. Cotyledons deciduous, petiolate. Stems ascending-erect, branched. Leaves cauline; stipules 5–13 mm; petiole 1–5 cm; leaflets 6–9, blades 20–60 × 4–8 mm, adaxial surface glabrous or with scattered hairs. Peduncles 1–8 cm; bracts ± persistent, 3–7 mm. Racemes open, 6–34 cm; flowers spirally arranged. Pedicels 2–4 mm. Flowers 8–10(–12) mm; calyx bulge or spur 0–1 mm, abaxial lobe entire or 3-toothed, 4–9 mm, adaxial lobe 2-toothed, 4–8 mm; corolla usually pale yellow to orange-yellow, sometimes white, banner patch orange to yellow, keel tip pale lavender, banner usually hairy abaxially, keel glabrous. Legumes 2.5–4 cm, hairy. Seeds 1–4, speckled tan and brown, 4.5–5.5 mm.

Phenology: Flowering Jun–Sep.
Habitat: Volcanic soils.
Elevation: 1000–3500 m.

Distribution

• Generated Map
• Legacy Map

Calif.

Discussion

Lupinus angustiflorus is known from the High Cascade Range, the northern and central High Sierra Nevada, and the Great Basin region of northeastern California. It is usually found on volcanic soils asso­ciated with yellow pine, red fir, lodgepole pine, and mountain hemlock forests. In Mono County, it is more commonly associated with sagebrush, bitterbrush, rabbitbrush, and wax currant. The persistent bracts, yellow flowers, and abaxial pubescence on the banner clearly separate this taxon from other species.

Selected References

None.

Lower Taxa

None.