Flora of North America species comparison

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Astragalus humistratus var. humivagans
Photo is of parent taxon

groundcover milkvetch, spreading milkvetch
Habit 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.
Leaves

1–6(–7.5) cm;

leaflets (7–)11–17(or 19), blades (2–)5–17(–19) mm, apex usually acute, surfaces pubescent adaxially.
Racemes

(3–)7–22-flowered;

axis 1–9(–13) cm in fruit.
Peduncles

2–9 cm.
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.
Stipules

1.5–9 mm.
2n

= 24.

Astragalus humistratus var. humivagans
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. (4300–10800 ft.)
Distribution
from FNA
AZ; NM; NV; UT
[BONAP county map]
Discussion

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

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Humistrati > Astragalus humistratus
Sibling taxa
A. humistratus var. crispulus, A. humistratus var. hosackiae, A. humistratus var. humistratus, A. humistratus var. sonorae, A. humistratus var. tenerrimus
Synonyms Batidophaca humivagans
Name authority (Rydberg) Barneby: Amer. Midl. Naturalist 55: 478. (1956)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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