Astragalus ernestii H. F. Comber

Tium wilsoni (Greene) Rydberg
Astragalus Wilsoni Greene, Pittonia 3: 196. 1897.
A perennial, with a woody root; stems several, striate, glabrous, 3-5 dm. high, often purplish with small white dots; leaves 8-10 cm. long, ascending or spreading; stipules deltoid, 5-7 mm. long; leaflets 19-25, oval or obovate, acute at the base, rounded at the apex, rather firm, 10-18 mm. long, 5-8 mm. wide, glabrous or nearly so on both sides; peduncles 5-8 cm. long; racemes rather dense, 3-6 cm. long; bracts lanceolate, 3 mm. long, sparingly hairy; pedicels ascending, about 2 mm. long; calyx sparingly white-hairy, the tube 6 mm. long, the teeth subulate, 3 mm. long; corolla white, 15—16 mm. long; banner obovate, moderately arcuate; wings nearly as long, the blade oblong, falcate; keel-petals shorter, the blade broadly lunate, rounded at the apex; pod oblong, acute at each end, glabrous, 2-2.5 cm. long, 6 mm. thick, and 5 mm. wide, mottled, somewhat sulcate on the upper suture.
Type locality: Northern Arizona. Distribution: Arizona.