Flora of North America species comparison

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Astragalus humistratus var. crispulus
Photo is of parent taxon

curly-hair milkvetch, groundcover milkvetch
Habit Plants gray-villous, often also subtomentose, hairs extremely fine, weak, sinuous or curly, herbage cinereous.
Stems

(5–)15–55 cm.
Leaves

1–4.5(–5) cm;

leaflets 11–15, blades (2–)3–14 mm, surfaces pubescent adaxially.
Racemes

(3–)5–12-flowered;

axis (0.5–)1–3 cm in fruit.
Peduncles

(1–)1.5–3.5(–4) cm.
Flowers

calyx 4.6–5.5 mm, tube 2.9–4 mm, lobes subulate, 1.2–2.4 mm;

corolla whitish, faintly tinged with pink;

banner 7–9.2 × (3–)4–5 mm.
Legumes

lunately semi-ellipsoid, incurved, 8–10 × 2.5–3 mm, villosulous.
Seeds

6–9.
Stipules

2.5–8 mm.

Astragalus humistratus var. crispulus
Phenology Flowering Aug–Sep.
Habitat Xeric pine forests, on sandy soils of volcanic origin on slopes, benches, ledges.
Elevation 2100–2500 m. (6900–8200 ft.)
Distribution
from FNA
AZ; NM
[BONAP county map]
Discussion

Variety crispulus, endemic to the White Mountains of southeastern Arizona and the San Francisco Mountains of adjacent New Mexico, is sometimes sympatric with var. humistratus, and the two are remarkably different in appearance. The link between them is var. humivagans, which extends eastward into their range, but generally, and perhaps exclusively, at lower elevations.

(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. hosackiae, A. humistratus var. humistratus, A. humistratus var. humivagans, A. humistratus var. sonorae, A. humistratus var. tenerrimus
Name authority Barneby: Leafl. W. Bot. 4: 53, figs. 24–26. (1944)
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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