Herbs, perennial, 3–6 dm, woolly-tomentose. Cotyledons deciduous, petiolate. Stems decumbent or erect, branched just above ground, hairs less than 1 mm, not sharp or stiff. Leaves cauline, clustered at base; stip­ules 7–12 mm; petiole 5–12 cm; leaflets 5–9, blades 15–40 × 5–12 mm, adaxial surface densely tomentose to woolly, hairs ± spreading. Peduncles stout, 6–10 cm; bracts deciduous, 7–8 mm. Racemes 10–40 cm; flowers ± whorled or not. Pedicels 2–5 mm. Flowers 10–15 mm; calyx bulge or spur 0–1 mm, abaxial lobe 3-toothed, 6–8 mm, adaxial lobe deeply notched, 6–7 mm; corolla bluish to purple, banner patch yellow turning purple to white, banner well reflexed-recurved at or proximal to midpoint, this 3.5–6 mm proximal to apex, banner gla­brous or ± hairy abaxially, lower keel margins glabrous, adaxial margin ciliate middle to tip. Legumes 2–3 cm, hairy. Seeds 3 or 4, mottled grayish, 4–7 mm.

Phenology: Flowering Apr–Jul.
Habitat: Open, grassy areas, on limestone and sandstone, oak woodlands.
Elevation: 50–600 m.

Distribution

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Calif.

Discussion

Lupinus ludovicianus is known only from San Luis Obispo County.

Selected References

None.

Lower Taxa

None.