Lupinus arizonicus

Herbs, annual, 1–6 dm, with short-appressed and long, spreading hairs. Cotyledons deciduous, petiolate. Stems erect, usually branched, sometimes unbranched. Leaves cauline; petiole 2–8 cm; leaflets 5–10, blades 10–40 × 4–12 mm, adaxial surface glabrous. Peduncles 1–6 cm; bracts usually persistent, 4–8 mm. Racemes 6–30 cm; flowers spirally arranged or appearing ± whorled proximally. Pedicels 2–4 mm. Flowers 7–10 mm; calyx 3–6 mm, lobes ± equal, abaxial lobe entire, adaxial lobe deeply cleft; corolla banner and wings dark pink to magenta, drying blue-purple or whitish, banner spot yellowish, becoming darker magenta, lower keel margins ciliate near claw, upper margins glabrous. Legumes often secund, 1–2 cm, coarsely pubescent. Seeds 4–6. 2n = 48.

Phenology: Flowering spring.
Habitat: Sandy washes, open areas.
Elevation: 0–1100 m.

Distribution

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Ariz., Calif., Nev., Mexico (Baja California, Baja California Sur, Sonora).

Discussion

Lupinus arizonicus occurs in the eastern Mojave and Sonora deserts of southeastern California, southwestern Arizona, and southern Nevada, plus adjacent areas in northern Mexico.

Robust plants have been named var. barbatulus.

Selected References

None.

Lower Taxa

None.