Astragalus robbinsii var. occidentalis S. Wats.

Atelophragma occidentale (S. Wats.) Rydb. Bull. Torrey Club 55: 128.
Astragalus Robbinsii occidenlalis S. Wats. Bot. King's Expl. 70. 1871. Astragalus occidenlalis M. E. Jones. Contr. W. Bot. 8: 17. 1898. Astragalus labradoricus occidenlalis M. E. Jones, Rev. Astrag. 134. 1923.
A perennial, with a cespitose rootstock; stem 2-5 dm. high, striate, glabrous or nearly so; haves 5-10 cm. long, ascending; stipules ovate, 6-7 mm. long, green; leaflets 9-13, elliptic or oval, rounded at the apex, 1-3 cm. long, 3-12 mm. wide, thin, glabrous above, sparingly strigose beneath; peduncles S— 15 dm. long; racemes lax, 5-15 cm. long; bracts lance-subulate, 3 mm. long; pedicels 4—5 mm. long; calyx black-hairy, the tube about 3 mm. long, 2 mm. wide, the teeth subulate, 1 mm. long; corolla purple, similar to that of .1. Macounii; wings emarginate; pod subsessile, black-strigose, ellipsoid, 15-18 mm. long, tapering at each end, sometimes slightly sulcate on the lower suture, the septum nearly 1 mm. wide, the cross-section elliptic.
Type locality: East Humboldt Mountains, Nevada. Distribution: Type locality and vicinity.