Astragalus giganteus S. Wats.

Astragalus giganteus S. Wats. Proc. Am. Acad. 17: 370. 1882
Astragalus yaquianus S. Wats. Proc. Am. Acad. 23: 270. 1888.
Astragalus texanus Sheldon. Minn. Bot. Stud. 1: 65. 1894.
Astragalus giganteus yaquianus M. E. Jones, Rev. Astrag. 234 (as to type). 1923.
A perennial, with a rootstock; stem 3-15 dm. high, flexuose, silky, in age with brownish, tangled, appressed hairs; leaves short-petioled, 1.5-2 dm. long, ascending; stipules deltoid, herbaceous, 5-8 mm. long; leaflets 21-31, oval or elliptic, acute or obtuse, 1.5-3.5 cm. long, silky-tomentose with loosely appressed, tangled hairs; peduncles 1-2 dm. long, strict; racemes dense, 5-15 cm. long; bracts lance-subulate, 5 mm. long; calyx silky-tomentose, the tube 7-8 mm. long, 3 mm. broad, the teeth subulate, 3 mm. long; corolla ochroleucous, about 2 cm. long; banner narrowly obovate, nearly straight, slightly retuse at the apex; wings shorter, narrow, the blade linear-oblong, with a large reflexed basal auricle; keel-petals much shorter, about 1.5 cm. long, the blade strongly lunate, rounded at the apex, with a large broad auricle; pod oblong-ovoid, abruptly acuminate, glabrous, 15-20 mm. long, 8 mm. thick, and 6 mm. wide, somewhat reticulate, slightly sulcate on both sutures.
Type locality: Fort Davis, Western Texas.
Distribution: New Mexico, Chihuahua, and western Texas.