262 NORTH AMERICAN FLORA [Volume 24 



9. Homalobus stipitatus Rydb. Bull. Torrey Club 34: 419. 1907. 



A perennial, with somewhat cespitose caudex ; stems slender, 3-4 dm. high, erect, branched, 

 sparingly strigose or glabrate, leafy; stipules lanceolate or the lower deltoid, connate, 2-3 mm.- 

 long, turning black in drying; leaves ascending, 4-6 cm. long; leaflets 9-15, narrowly linear, 

 1-2 cm. long, 1-2.5 mm. wide, glabrous on both sides or sparingly strigose beneath; racemes 

 lax, including the short peduncle 3-10 cm. long, 5-20-flowered; calyx strigose, the tube 1.5-2 

 mm. long, the teeth subulate, 1.5 mm. long; corolla ochroleucous; banner obovate, slightly re- 

 tuse, 7-8 mm. long; wings 6-7 mm. long, the blade obliquely oblanceolate, with an acute basal 

 auricle, and about twice as long as the claw ; keel-petals 5-6 mm. long, with a rounded incurved 

 tip; pod glabrous, stipitate, the stipe 5-7 mm. long, the body elliptic, acute at each end, about 

 1 cm. long, 3 mm. wide; seeds as in H. tenellus. 



Type locality: Upper Missouri [South or North Dakota, between Fort Pierre and Devil's Lake|. 

 Distribution: Minnesota to Saskatchewan and South Dakota. 



10. Homalobus strigulosus Rydb. Bull. Torrey Club 34: 420. 1907. 



Astragalus tenellus f. strigulosus F. Macbr. Contr. Gray Herb. 65: 34. 1922. 



A perennial, with a cespitose caudex; stem erect or ascending, branched, 1-3 dm. high, 

 strigulose; stipules ovate, short, blackening; leaves 3-4 cm. long; leaflets 11-17, linear, acute, 

 8-12 mm. long, 1-2 mm. wide, thick, glabrous above, strigose beneath; racemes lax, including 

 the short peduncle 2-4 cm. long, 4— 7-flowered; bracts subulate, minute; calyx strigulose, the 

 tube 1.5-2 mm. long, the teeth subulate, less than 1 mm. long; corolla ochroleucous, similar 

 to that of the preceding; banner 6 mm. long; wings about 5 mm. long and keel-petals fully 

 5 mm. long; pod strigulose, shining, stipitate, the stipe about 3 mm. long, the body 1-10 mm. 

 long, 3 mm. wide. 



Type locality: East Humboldt Mountains, Nevada. 

 Distribution: Utah and eastern Nevada. 



11. Homalobus acerbus (Sheldon) Rydb. Bull. Torrey Club 

 32: 666. 1906. 



Astragalus acerbus Sheldon. Minn. Bot. Stud. 1: 123. 1894. 



Astragalus tenellus f. acerbus F. Macbr. Contr. Gray Herb. 65: 35. 1922. 



A perennial, with a cespitose caudex; stems white-strigose, 3-3.5 dm. high, erect, striate 

 below; stipules triangular-ovate, 1-2 mm. long, scarious; leaves 2.5-5 cm. long, the rachis 

 sulcate above; leaflets 5-7, those of the upper leaves linear, the lateral ones 4-8 mm. long, the 

 terminal one sometimes 15-20 mm. long, those of the lower leaves oval or obovate, 5-8 mm. 

 long, 2-3 mm. wide; racemes lax, including the peduncle 1-2 dm. long; calyx sparingly strigose 

 with black hairs, the tube 1.5 mm. long, the teeth deltoid-subulate, 1 mm. long; corolla white, 

 tinged with greenish hue; banner 5 mm. long; wings slightly longer than the keel; keel-petals 3 

 mm. long, with roundish tips; pod 10-12 mm. long, oblong, short-stipitate, glabrous, 3 mm. 

 wide; seeds black, oblong-reniform, nearly 3 mm. long, 1.5 mm. wide. 



Type locality : Glenwood Springs, Colorado. 



Distribution : Western Colorado. 



Illustration: M. E. Jones, Rev. Astrag. pi. l,f. b, e [as var. Dodgeanus\. 



12. Homalobus Standleyi Rydb. Bull. Torrey Club 50: 182. 1923. 



Astragalus tenellus dementis F. Macbr. Contr. Gray Herb. 65: 35, in part. 1922. 



A perennial, with a cespitose caudex; stems 2-3 dm. high, sparingly strigose; stipules 

 deltoid, about 2 mm. long, connate; leaves 3-5 cm. long; leaflets 9-15, elliptic or oblong, 5-10 

 mm. long, 2-3 mm. wide, glabrous above, strigose beneath; racemes lax, including the short 

 peduncle 4-7 cm. long; bracts lance-subulate, 1-2 mm. long; calyx strigose, the tube 2 mm. 

 long, the teeth subulate, fully 1 mm. long; corolla white or tinged with purple, the keel purple- 

 tipped; banner 6 mm. long, obovate, slightly retuse; wings 5 mm. long; keel-petals 5 mm. long, 



