Herbs perennial or (precocious) annual, caulescent, very slender, inconspicuous; caudex superficial. Hairs basifixed. Stems few to several. Stipules distinct or ± connate at proximal nodes. Leaves odd-pinnate, often shorter than distal racemes, petiolate; leaflets 5–15. Racemes dimorphic, proximal ones subradical and often reduced to a single flower, more distal ones loosely 2–7-flowered, flowers ascending. Calyx tubes campanulate. Corollas ochroleucous or violet-tinged, banner recurved through 90°, keel apex strongly incurved, obtuse. Legumes persistent or eventually deciduous, sessile or subsessile, humistrate, obovoid to oblong-ellipsoid, straight or ± decurved, slightly compressed dorsiventrally, semibilocular. Seeds 14–18.

Distribution

sw United States, Mexico.

Discussion

Species 2 (1 in the flora).

Section Quinqueflori comprises a solitary species in the southwestern United States and Astragalus quinqueflorus S. Watson in Mexico.

Selected References

None.

Lower Taxa

Astragalus brandegeei