Leaflet blades obovate to oblanceolate, apex obtuse to acute, sometimes mucronulate. Peduncles 30–60(–80) mm. Flowers 12–16 mm. Legumes 15–25(–30) × 3–4 mm.

Phenology: Flowering spring–summer.
Habitat: Dry limestone mesas, ridges, slopes, washes, sandy or tuffa­ceous soils, scrub, dry, rocky grasslands, open Ponderosa pine or oak-pinyon-juniper woodlands.
Elevation: 900–2300 m.

Distribution

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Ariz.

Discussion

Variety mearnsii is present in northern Arizona in Coconino, Navajo, and Yavapai counties. It possibly hybridizes with Acmispon rigidus and A. wrightii (A. M. Ottley 1944; D. Isely 1981).

Selected References

None.

Lower Taxa

None.