Herbs, 8–30 cm, with very short internodes, appearing almost fasciculate; from tap­root. Leaves 30–100 × 13–30 mm; stipules lanceolate, 2–3 × 1–1.3 mm; pinnae 7–9; leaflets 9–19 per pinna, blades obtuse-ovate, 1–5.5 × 1–2.3 mm, surfaces glabrous or sparsely strigose abaxially, glabrous or sparsely pubescent adaxially. Racemes 3–11-flowered, terminal, 6–27 cm; rachis and pedicels strigose, eglandular. Flowers turbinate, 6–9 × 3.5–5 mm; calyx persistent, often roseate to burgundy, distinct portion 3–5 × 1–2 mm, pubescent to strigose abaxially, eglandular; banner yellow, sometimes tinged with red, 5–8 × 2.5–4.5 mm, glabrous abaxially, with small tuft of trichomes at base of claw adaxially; lateral petals yellow, sometimes tinged red, 6.5–8 × 2–5 mm, glabrous abaxially. Legumes flat, arcuate, sometimes forming nearly a full circle, pale brown or reddish, falcate, 23–40 × 5–8 mm, indehiscent, margins parallel, pronounced, puberulent, apex round, with remnants of withered style; valves reticulate, puberulent. Seeds 6–11. 2n = 24.

Phenology: Flowering spring (late summer).
Habitat: Grasslands in sandy or clay limestone soils.
Elevation: 900–2000 m.

Distribution

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Ariz., Colo., Kans., N.Mex., Tex., Mexico (Chihuahua, Coahuila).

Discussion

Selected References

None.

Lower Taxa

None.