Astragalus hallii A. Gray

Pisophaca hallii (A. Gray) Rydberg
Astragalus Hallii A. Gray, Proc. Am. Acad. 6: 224. 1864. Tragacanlha Hallii Kuntze, Rev. Gen. 945. 1891.
Astragalus gracilentus Hallii M. E. Jones, Contr. W. Bot. 8: 13. 1898. Homalobus Hallii Rydb. Bull. Torrey Club 32: 667. 1905.
A cespitose perennial, with a woody root; stems numerous, sometimes partly under ground, 3-5 dm. long, decumbent, fexuose, branched, striate, sparingly strigose, 3-6 dm. long; leaves spreading, 5-10 cm. long, the rachis strigose; stipules lance-deltoid, 3-4 mm. long; leaflets 13-23, oblong or elliptic, cuneate at the base, rounded, truncate, or retuse at the apex, glabrous above, strigose beneath, 5-15 mm. long, 2-6 mm. wide; peduncles erect, 4-12 cm. long; racemes 3-8 cm. long; bracts subulate 2-3 mm. long, sometimes often purple-tinged, the tube 5 mm. long, 2.5 mm. thick, the teeth unequal, deltoid, about 1 mm. long; corolla 12-15 mm. long, purple; banner decidedly arcuate; wings slightly shorter, the blade broadly oblanceolate, about equaling the claw, with a reflexed auricle; keel-petals broader and shorter, the blade semi-orbicular, shorter than the claw; pod oblanceolate-ellipsoid, slightly broader above the middle, terrete, short-stipitate, acute at each end, glabrous, about 2 cm. long, 5-6 mm. wide and thick; seeds brown, obliquely reniform, 2 mm. long.
Type locality: Valleys of the Rocky Mountains of Colorado. Distribution: Mountains of Colorado.