270 NORTH AMERICAN FLORA [Volume 24 



34. Homalobus microcarpus Rydb. Bull. Torrey Club 

 34:417. 1907. 



Homalobus camporum Rydb. Bull. Torrey Club 32: 666, in part. 1906. 



A perennial, with a cespitose rootstoek, branching near the surface; stem decumbent, 

 1-2 dm. high, strigose; leaves numerous, 5-8 cm. long; stipules scarious, ovate, 2-3 mm. long; 

 leaflets 9-15, elliptic to linear, 5-15 mm. long, 1-3 mm. wide, glabrous above, sparingly strigose 

 beneath, obtuse or acutish; peduncles 4—6 cm. long; racemes short, 3-8-flowered; calyx strigose 

 with black hairs, the tube about 2 mm. long, the teeth about 1 mm. long, subulate; corolla 

 white, the keel tipped with purple; banner broadly obovate, S mm. long; wings and keel-petals 

 6 mm. long, similar to those of H. hylophilus; pod sessile, strigose, straight, 12-18 mm. long, 

 nearly 3 mm. wide; seeds oblong-reniform, 2 mm. long. 



Type locality: East slope of Rabbit Ear Range, Colorado. 

 Distribution: Northern Colorado, southern Wyoming and Utah. 



35. Homalobus paucijugus Rydb. Bull. Torrey Club 34: 418. 1907. 



Astragalus Garreltii F. Macbr. Contr. Gray Herb. 65: 36. 1922. 



A perennial, with a cespitose caudex, bushy; stems 1-2 dm. high, sparingly strigose; 

 leaves numerous, 5-10 cm. long; stipules scarious, ovate, 2-3 mm. long; leaflets 1-5, the lateral 

 ones lanceolate to linear-subulate, 1 cm. or less long, glabrous above, sparingly strigose beneath, 

 sometimes lacking, the terminal one 1-2 cm. long, linear or linear-oblanceolate, gradually taper- 

 ing into the rachis; peduncles 3-6 cm. long; racemes short, 3-6-flowered; bracts lanceolate, 2 

 mm. long; calyx strigose with black hairs, the tube about 2 mm. long, the teeth subulate, fully 

 1 mm. long; corolla as in//, microcarpus; legume 12-15 mm. long, 2 mm. wide, straight, strigose, 

 acute at each end; seeds olive-brown, 2.5 mm. long, 1.5 mm. broad. 



Type locality: Big Cottonwood Canon, Utah. 

 Distribution: Known only from the type locality. 



36. Homalobus oblongifolius Rydb. Bull. Torrey Club 34: 50. 1907. 



Astragalus hylophilus oblongifolius F. Macbr. Contr. Gray Herb. 65: 37. 1922. 



A perennial, with a rootstoek and cespitose caudex; stem ascending, branched, 2-3 dm. 

 high, sparingly strigose or glabrate; leaves 8-10 cm. long; stipules ovate or lanceolate, 

 scarious, the lower connate; leaflets 11-19, from elliptic to linear-oblong, usually oblong, 1-2 

 cm. long, 3-6 mm. wide, glabrous above, sparingly strigose beneath, rounded at the apex; 

 peduncles 5-10 cm. long; racemes short, 3-5 cm. long, 5-10-flowered; bracts lanceolate, scarious, 

 1 mm. long; calyx strigose with black hairs, the tube 2-2.5 mm. long, the teeth subulate, fully 



1 mm. long; corolla white, tinged with purple, the keel purple-tipped; banner 1 cm. long, 

 obovate, retuse; wings and keel-petals 8 mm. long, similar to those of //. hylophilus; pod about 



2 cm. long, 3 mm. wide, usually broadest above the middle, acute, the tip slightly curved 

 upwards; seeds oblong. 



Type locality: Cerro Summit, Colorado. 

 Distribution: Colorado. 



37. Homalobus decurrens Rydb. Bull. Torrey Club 31: 563. 1904. 



Astragalus Rydbergii F. Macbr. Contr. Gray Herb. 65: 37. 1922. 



A perennial, with a cespitose rootstoek or caudex; stems erect, 3-4 dm. high, slightly 

 strigose and angled; leaves 1-1.5 dm. long; upper stipules lanceolate, free, 4-5 mm. long, green, 

 the lower ones scarious, broader, and connate; leaflets 11-15, linear-oblong or oblanceolate, 

 glabrate above, strigose beneath, the terminal one usually larger, more or less decurrent on the 

 rachis, without a distinct node, 2-5 cm. long, 3-6 mm. wide, the lateral ones 1.5-4 cm. long, 

 all mucronate or cuspidate; racemes slender, lax, including the peduncle 1-2 dm. long, 5-10- 

 flowered; bracts subulate, about 2 mm. long; calyx more or less black-hairy, the tube about 

 2.5 mm. long, the teeth subulate, nearly 2 mm. long; corolla white, the keel tipped with purple; 

 banner obovate, retuse, 10-12 mm. long; wings and keel-petals 9-10 mm. long, the blade of 



