Herbs perennial, caulescent; caudex deeply subterranean. Hairs basifixed. Stems single or few. Stipules connate or distally distinct. Leaves odd-pinnate, petiolate; leaflets 7–21. Racemes loosely flowered, flowers ascending. Calyx tubes short-cylindric. Corollas ochroleucous or pink-purple, banner recurved through 25–30°, keel apex obtuse. Legumes persistent, stipitate, erect or ascending, ellipsoid, ovoid, or subglobose, inflated, ± unilocular. Seeds 17–25.

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.

Selected References

None.

Lower Taxa

Astragalus ampullarioides, Astragalus ampullarius