Astragalus thompsonae S. Watson

Astragalus thompsonae S. Wats. Proc. Am. Acad 10:345. 1875.
Tragacantha Thompsonae Kuntze, Rev. Gen. 948. 1891.
Astragalus syrticotus Sheldon, Minn. Bot. Stud. 1: 22. 1894.
Astragalus Bigelovii Thompsonae M. E. Jones, Contr. W. Bot. 8: 23. 1898.
A subacaulescent cespitose perennial; stems numerous from the base, very short and covered by the broad stipules; leaves 5-15 cm. long; stipules deltoid, densely white-pubescent, about 5 mm. long; rachis white-villous, with rather short spreading hairs; leaflets 25-35, broadly ovate, 5-10 mm. long, rounded or truncate at the apex, densely white-villous; peduncles 5-10 cm. long; bracts lanceolate or lance-subulate, membranous, villous; calyx white-villous, the tube about 1 cm. long, 4 mm. broad, the teeth subulate, 3 mm. long; corolla light-purple, about 2 cm. long; banner obovate, moderately arcuate; wings slightly shorter, the blade oblong, with a very large reflexed auricle; keel-petals about 16 mm. long, the blade broadly lunate, obtuse, with a smaller spreading auricle; pod densely silky-villous with long spreading hairs, about 2 cm. long, 8 mm. thick, and 5 mm. wide, strongly arcuate, deeply sulcate on both sutures, 1 -celled at the apex.
Type locality: Southern Utah.
Distribution: Utah, Arizona, and western Colorado.