Astragalus atratus S. Wats.

Tium atratum (S. Wats.) Rydberg
Astragalus alratus S. Wats. Bot. King's Expl. 69. 1871.
Tragacantha atrata Kuntze. Rev. Gen. 943. 1891.
Astragalus alratus stenophyllus M. E. Jones, Zoe 3: 297. 1893.
Astragalus atralus arclus Sheldon, Minn. Bot. Stud. 1: 160. 1894.
Astragalus atratus phyllophorus M. E. Jones, Contr. W. Bot. 10: 62. 1902.
Hamosa atrata Rydb. Bull. Torrey Club 34: 48. 1907.
A perennial, with a woody root and short caudex; stems ascending, slender, 1-3 dm. high, strigose or glabrate; leaves ascending, 4-10 cm. long; stipules deltoid, 2 mm. long; leaflets 9-15, linear or oblong, 4-15 mm. long, 1-2 mm. wide, obtuse, strigose on both sides or glabrate above; peduncles 5-15 cm. long; racemes 3-5 cm. long, rather lax; brads lanceolate, 2 mm. long; pedicels 2-4 mm. long, recurved; calyx black-hairy, the tube 4 mm. long, 2 mm. wide, the teeth lance-subulate, 1.5-2 mm. long; corolla white, 8-10 mm. long; banner ovate, strongly arched, notched, purple-striate; wings fully as long, the blade oblong, usually 2-lobed at the apex; keel-petals shorter, the blade broadly lunate, nearly semiorbicular, more strongly arched at the middle; pod pendulous, short-stipitate, linear, 1.5-2 mm. long, 2-2.5 mm. wide and thick, strigose, slightly sulcate on the upper suture, the septum nearly meeting the upper suture.
Type locality: Pah-Ute Range, Nevada. Distribution: Nevada.