Prairie Milkvetch

Astragalus chandonnetii Lunell, Am. Midi. Nat 2: 127. 1911.
Astragalus adsurgens albiflorus Blankinship, Mont. Agr. Coll. Stud. 1: 71. 1905. Not A. albifloras Gand. 1902.
A perennial, with a cespitose caudex; stems 2-4 dm. high, strigose, flexuose; leaves ascending, 5-10 cm. long; stipules scarious, deltoid, acuminate, 5-10 mm. long; leaflets 1 1-19, oblong or elliptic, 1-2.5 cm. long, 4-7 mm. wide, silvery-strigose on both sides, mostly obtuse; peduncles 7-15 cm. long, strict; racemes dense, 3-8 cm. long; bracts lance-subulate, 3-5 mm. long; flowers subsessile, ascending; calyx strigose with white hairs, the tube 4 mm. long, 2 mm. broad, the teeth subulate, 3-4 mm. long; corolla white or ochroleucous, about 15 mm. long; banner oblanceolate, retuse at the apex, moderately arched, with spreading margins; wings much shorter, the blade oblanceolate, somewhat falcate, as long as the narrow claw, with a large reflexed auricle; keel-petals still shorter, the blade obliquely lunate, more arched towards the obtuse tip; pod silvery-strigose, obliquely ovoid, 1 cm. long, 3 mm. wide and thick, deeply sulcate on the lower suture, cordate in cross-section.
Type locality: McHugh, near Detroit, Minnesota. Distribution: Minnesota to Wyoming and Montana.

Astragalus sulphurescens Rydb. Bull. Torrey Club 28:36. 1901.
Astragalus Crandallii Gand. Bull. Soc. Bot. Fr. 48: xiv. 1902.
A perennial, with a cespitose caudex; stems ascending, 3-4 dm. high, angled and striate, glabrous or slightly strigose; leaves ascending, 6-12 cm. long; stipules ovate to lanceolate, somewhat scarious; leaflets 13-19, elliptic, obtuse or acute, 12-30 mm. long, glabrous above, sparingly strigose beneath; peduncles 5-15 cm. long; racemes 3-8 cm. long, dense; bracts lanceolate-subulate, about 8 mm. long; flowers ascending, subsessile; calyx strigose with mixed white and black hairs, the tube 4-5 mm. long, the teeth subulate-filiform, fully as long; corolla light-yellow, 15-18 mm. long; banner oblanceolate, moderately arched; wings much shorter, the blade almost linear, falcate, as long as the claw, with a large basal auricle; keelpetals shorter, the blade broadly lunate, obtuse; pod about 1 cm. long, 3-4 mm. wide and thick, strigose with black hairs, deeply sulcate on the lower suture, cordate in cross-section.
Type locality: Georgetown, Colorado. Distribution: Colorado.