Herbs, perennial (often with annual aspect), 0.1–2 dm, con­spicuously pilose, from tap­root. Cotyledons deciduous, petiolate. Stems prostrate to decumbent, clustered, acaules­cent or short-spreading and un­branched. Leaves mostly near base, in a rosette; stipules 4–10 mm; petiole 1–9 cm; leaflets 5–7(or 8), blades 10–55 × 4–12 mm, adaxial surface greenish, surfaces copiously villous-hirsute with long, spreading hairs, abaxially more dense. Peduncles 3–4.5 cm; bracts deciduous, 4–8 mm. Racemes 6–23 cm; flowers spirally arranged. Pedicels 1–4 mm. Flowers 7–13 mm; calyx bulge or spur 0–1 mm, lobes entire, 5–7.5 mm; corolla violet-blue, banner yellow toward center, tip of keel purple, wings yellow toward center, banner glabrous abaxially, upper keel margins ciliate to densely ciliate. Legumes 1.5–2 cm, hispid. Seeds 3–5, dark with light spots.

Phenology: Flowering Mar–May.
Habitat: Desert mountains, pine wood­lands, canyons along trails.
Elevation: 1500–2000(–2100) m.

Distribution

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Ariz., Mexico (Chihuahua, Durango, Sonora).

Discussion

Lupinus huachucanus occurs in the Santa Rita Moun­tains in Santa Cruz County, Chiricahua and Huachuca mountains in Cochise County, and in Pima County.

Lupinus huachucanus somewhat resembles L. concinnus but is readily distinguished by its spreading habit, racemes surpassing the foliage, violet-blue corollas, and ciliate keel. Lupinus concinnus is an annual with a more erect habit, pink corollas, and a non-ciliate keel.

Selected References

None.

Lower Taxa

None.