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Habit Herbs perennial, caulescent; caudex deeply subterranean.
Stems

single or few.

Leaves

odd-pinnate, petiolate;

leaflets 7–21.

Racemes

loosely flowered, flowers ascending.

Corollas

ochroleucous or pink-purple, banner recurved through 25–30°, keel apex obtuse.

Calyx

tubes short-cylindric.

Legumes

persistent, stipitate, erect or ascending, ellipsoid, ovoid, or subglobose, inflated, ± unilocular.

Seeds

17–25.

Hairs

basifixed.

Stipules

connate or distally distinct.

Astragalus sect. Ampullarii

Distribution
sw United States
Discussion

Species 2 (2 in the flora).

Section Ampullarii is considered here to contain two distinctive species held together by their subterranean caudices, connate proximalmost stipules, and inflated pods; distributions on Triassic Chinle muds are as noted below.

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

Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus
Subordinate taxa
Name authority Barneby: Mem. New York Bot. Gard. 13: 567. (1964)
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