Plants loosely strigulose to villosulous. Stems 10–40 cm. Leaflets: adaxial blade surface pubescent, sometimes sparsely so. Flowers (15–)16.4–21 mm; calyx (7.9–)9.1–11.2 mm, tube (6.9–)7.5–9.7 mm, lobes (0.5–)1–2.3 mm. Legumes hamately incurved or coiled into a ring, 20–35 × (2.7–)3–4.1(–5.5) mm, usually villosulous or strigulose, rarely glabrate or glabrous; stipe (9–)11–20 mm. Seeds 18–25(–28).

Phenology: Flowering mid Apr–Jul.
Habitat: Plains and foothills with sagebrush on sandy or gravelly soils overlying igneous formations, on dunes, with sagebrush.
Elevation: 800–2800 m.

Distribution

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Calif., Idaho, Nev., Oreg.

Discussion

Specimens of var. curvicarpus with fruits coiled in a ring have sometimes been mistaken for Astragalus speirocarpus, which has flowers ascending and the calyx gibbous abaxially. Plants of this variety with fruits tightly coiled were named A. whitedii Piper forma speirocarpoides Barneby.

Selected References

None.

Lower Taxa

None.