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Photo is of parent taxon
Habit Plants winter-annual or biennial, coarse, (10–)15–50 cm, strigulose; from superficial root-crown. Herbs perennial, biennial, or annual, caulescent; caudex usually superficial (shallowly subterranean in A. perianus).
Stems

decumbent to incurved-ascending or almost prostrate, strigulose.

single, few, or several to many.

Leaves

(2–)4–10(12) cm;

stipules usually distinct, very rarely connate at proximal nodes, (1.5–)2.5–7(–10) mm, submembranous becoming papery;

leaflets (7–)11–19[–23], blades narrowly oblanceolate, linear-oblong, or oblong-obovate, 5–20 mm, apex retuse-truncate or obtuse, often callous-apiculate, surfaces strigulose abaxially, strigulose or glabrous adaxially.

odd-pinnate, subsessile to petiolate;

leaflets (3 or)5–35.

Racemes

[2 or](3–)5–10(–15)-flowered, flowers ascending to spreading or declined;

axis (0.5–)1–4(–5) cm in fruit;

bracts 1–3.2 mm;

bracteoles 2.

loosely or densely flowered, flowers spreading to ascending or declined.

Peduncles

incurved-ascending, (0.5–)1.5–5.5(–7) cm.

Pedicels

1–3.5 mm.

Flowers

4.6–7.5 mm;

calyx campanulate or turbinate-campanulate, 4.3–6.4 mm, strigulose or villosulous, tube 2.1–2.9(–3.2) mm, lobes lanceolate-subulate, 2–3.5 mm;

corolla whitish, sometimes tinged pink or lavender, or pale to vivid reddish lilac;

banner recurved through 50°;

keel (4.1–)4.4–6.4 mm, apex usually broad and blunt, rarely triangular and subacute, sometimes obscurely beaklike.

Corollas

white, whitish, yellowish, lilac, blue-violet, or pink-purple, often drying violet, banner recurved through 40–125°, keel apex rounded, deltate, or narrowly triangular, often beaklike.

Calyx

tubes campanulate, turbinate-campanulate, or obconic-campanulate.

Legumes

spreading or declined (usually humistrate), green or purplish-tinged, rarely lightly mottled, becoming stramineous, straight or slightly incurved, broadly and subsymmetrically, or somewhat obliquely, ovoid, ovoid-ellipsoid, ellipsoid, or subglobose, bladdery-inflated, (10–)15–37(–43) × (8–)12–20 mm, beak short and obscure, not well differentiated from body, thin becoming papery, lustrous, sparsely strigulose, hairs straight, [subvillosulous, or glabrate].

usually deciduous, sessile, gynophore sometimes present, spreading, ascending, or declined, globose to ovoid, lanceoloid-oblong, or -ellipsoid, bladdery-inflated or slightly swollen, usually unilocular, rarely semibilocular.

Seeds

(10–)13–21.

(3–)6–58(–76).

Hairs

basifixed.

Stipules

usually distinct, rarely connate at proximal nodes.

2n

= 22.

Astragalus wootonii var. wootonii

Astragalus sect. Inflati

Phenology Flowering Mar–Jul.
Habitat Desert- and mesquite-grasslands, in pinyon-juniper communities.
Elevation 600–2300 m. (2000–7500 ft.)
Distribution
from FNA
AZ; CA; CO; NM; TX; Mexico (Chihuahua, Durango, Sonora)
w United States; c United States; n Mexico; South America
Discussion

Variety wootonii occurs from extreme eastern Mojave Desert in San Bernardino County, California, through most of Arizona and the western half of New Mexico to extreme southern Colorado and trans-Pecos Texas, southward into Mexico.

The plants contain the indolizidine alkaloid swainsonine, and are potentially poisonous to livestock (L. F. James and S. L. Welsh 1992).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Species 35 (28 in the flora).

Section Inflati consists of five subsections: subsect. Macrodontes M. E. Jones (Astragalus deanei, A. douglasii, A. macrodon, A. oocarpus); subsect. Proriferi M. E. Jones (A. magdalenae, A. palmeri); subsect. Aridi M. E. Jones (A. allochrous, A. aquilonius, A. aridus, A. beatleyae, A. cerussatus, A. endopterus, A. geyeri, A. gilmanii, A. insularis, A. nutans, A. pardalinus, A. perianus, A. pubentissimus, A. sabulonum, A. serpens, A. thurberi, A. wardii, A. wootonii); subsect. Sparsiflori (M. E. Jones) Barneby (A. diaphanus, A. sparsiflorus, A. wetherillii); and subsect. Horniani Barneby (A. hornii).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Inflati > Astragalus wootonii Fabaceae > subfam. Faboideae > Astragalus
Subordinate taxa
Synonyms A. allochrous var. playanus
Name authority unknown A. Gray: Proc. Amer. Acad. Arts 6: 213. (1864)
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