Flora of North America species comparison

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Astragalus humistratus var. humistratus
Photo is of parent taxon

groundcover milkvetch
Habit Plants sparsely pilose-pilosulous, herbage green or greenish cinereous, sparsely pubescent.
Stems

(15–)20–60 cm.
Leaves

(1–)1.5–5.5 cm;

leaflets 11–17, blades 4–14 mm, surfaces glabrous or glabrate adaxially.
Racemes

(5–)7–30-flowered;

axis 1–6 cm in fruit.
Peduncles

2–8(–9.5) cm.
Flowers

calyx 5.8–7.6 mm, tube 3–3.8 mm, lobes lanceolate-acuminate or filiform-setaceous, 2.5–4.5 mm;

corolla greenish white to ochroleucous, often suffused or veined with purple;

banner 9.5–11.8 × 6–8 mm.
Legumes

obliquely oblong-ellipsoid or lanceoloid-ellipsoid, ± incurved, 14–18 × 4–6.5 mm, strigulose.
Seeds

(16–)18–26.
Stipules

2–9(–11) mm.
2n

= 24.

Astragalus humistratus var. humistratus
Phenology Flowering May–Sep.
Habitat Pine forests, pinyon-juniper, mesquite-juniper-saltbush, and blue-grama grassland communities, less commonly in spruce-fir forests.
Elevation 1300–2700 m. (4300–8900 ft.)
Distribution
from FNA
AZ; CO; NM; TX; Mexico (Chihuahua)
[BONAP county map]
Discussion

Variety humistratus intergrades with var. sonorae in southwestern 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. humivagans, A. humistratus var. sonorae, A. humistratus var. tenerrimus
Name authority unknown
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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