Astragalus humistratus var. humivagans

Plants densely strigose-pilose or pilosulous, hairs ± straight, sometimes shorter ones crispate or sinuous, herbage cinereous or silvery-canescent. Stems (6–)10–60(–80) cm, radiating from root-crown. Stipules 1.5–9 mm. Leaves 1–6(–7.5) cm; leaflets (7–)11–17(or 19), blades (2–)5–17(–19) mm, apex usually acute, surfaces pubescent adaxially. Peduncles 2–9 cm. Racemes (3–)7–22-flowered; axis 1–9(–13) cm in fruit. Flowers: calyx (4.5–)5–7.4(–8.8) mm, tube (2.4–)2.7–3.7(–4.1) mm, lobes lanceolate-acuminate or filiform-setaceous, (1.4–)1.9–3.6(–5) mm; corolla greenish white or ochroleucous, lined or suffused or margined with dull purple, sometimes all purple; banner 7.2–10.2(–11.6) × 5.5–8.4(–9) mm. Legumes obliquely ovoid, obovoid, semi-ovoid, or oblong-ellipsoid, (6–)8–14 × 3.5–5.7 mm, densely strigulose. Seeds 10–16. 2n = 24.

Phenology: Flowering May–Sep.
Habitat: Mountain brush, desert shrub, galleta grassland, sagebrush, pinyon-juniper, ponderosa pine, oak, manzanita, and aspen communities in gravelly, sandy, or clay substrates.
Elevation: 1300–3300 m.

Distribution

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Ariz., Nev., N.Mex., Utah.

Discussion

Variety humivagans is closely allied to var. humistratus and intergrades with it in northwestern New Mexico.

Selected References

None.

Lower Taxa

None.