450 NORTH AMERICAN FLORA [Volume 24 



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. 



26. 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; keel- 

 petals 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. 



27. Astragalus brevidens Rydberg, sp. nov. 



A perennial, with a cespitose caudex; stems decumbent at the base, about 3 dm. high, 

 more or less strigose; leaves ascending, about 1 dm. long; stipules lanceolate, acuminate, free, 

 5-7 mm. long; leaflets 17-21, elliptic or oval, 1-1.5 cm. long, 5-6 mm. wide, glabrous above, 

 silky-strigose beneath, rounded at the apex; peduncles 5-10 cm. long; racemes dense, 4-6 cm. 

 long; bracts lanceolate, 3-5 mm. long; flowers ascending, subsessile; calyx short-villous with 

 white hairs, the tube 4 mm. long, nearly 3 mm. broad, the teeth subulate, 1-1.5 mm. long; 

 corolla ochroleucous, 12 mm. long; banner oblanceolate, moderately arched; wings much 

 shorter, the blade oblong, slightly falcate, equaling the claw, with a large basal auricle; keel- 

 petals shorter, the blade broadly lunate, obtuse; young pod densely white-pubescent with 

 short crisp hairs, deeply sulcate on the lower suture, the mature pod not seen. 



Type collected 3 miles north of Whitney, Baker County, Oregon, Febr. 22, 1921, M. Peck 

 /0J60 '(herb. N. Y. Bot. Gard.). 



Distribution: Known oniy from the type locality. 



28. Astragalus virgultulus Sheldon, Minn. Bot. Stud. 

 1: 165. 1894. 



Astragalus hypoglotlis bradealus Osterhout, Bull. Torrey Club 26: 256. 1899. 

 Astragalus agrestis bradealus M. E. Jones, Contr. W. Bot. 10: 87. 1902. 



A perennial, with a cespitose creeping rootstock; stems several, branching, glabrous or 

 sparingly strigose, 1-2 dm. high, flexuous; leaves 4-7 cm. long, spreading; stipules oblong or 

 lanceolate, 4-8 mm. long, green; leaflets 15-19, linear or oblong, obtuse or slightly emarginate, 

 1-2 cm. long, 2-5 mm. wide, glabrous above, sparingly strigose beneath; peduncles 5-6 cm. 

 long, sulcate; racemes dense, 1.5-3 cm. long; bracts oblong or oblanceolate, 5-6 mm. long, 

 obtuse or acute; flowers ascending, subsessile; calyx appressed-pilose, mostly with white 

 hairs, the tube 6 mm. long, 2 mm. broad, the teeth subulate, 3-4 mm. long; corolla ochroleucous, 



