268 NORTH AMERICAN FLORA [Volume 24 



28. Homalobus orthocarpus Nutt.; T. & G. Fl. N. Am. 



1:351. 1838. 



Astragalus diversifolius A. Grav, Proc. Am. Acad. 6: 230. 1864. 

 Astragalus ibapensis M. E. Jones. Zoe 3: 290. 1893. 

 . Atelophragma ibapense Rydb. Bull. Torrey Club 40: 51. 1913. 

 Astragalus campesiris diversifolius F. Macbr. Contr. Gray Herb. 65: 35. 1922. 

 Astragalus junceus orthocarpus M. E. Jones. Rev. Astrag. 76. 1923. 

 Astragalus junceus diversifolius M. E. Jones, Rev. Astrag. Index. 1923. 



A perennial, with a rootstock, branching near the surface; steins 2-4 din. high, strigose- 

 canescent; leaves 3-8 cm. long, the lower 3-5-foliolate, the middle sometimes 7-9-foliolate, 

 and the uppermost simple; stipules triangular or ovate, the lower connate; leaflets linear or 

 lance-linear, acute at each end, 5-20 mm. long, strigose beneath, glabrous above, the terminal 

 one longer, the simple leaves sometimes nearly filiform; racemes lax, with the peduncle 5-10 

 cm. long, 3- 1 0-flowered ; bracts lanceolate, about 1 mm. long; calyx white-strigose, the tube 

 3-3.5 mm. long, the teeth lance-subulate, nearly 1 mm. long; corolla ochroleucous, 8 mm. 

 long, the petals similar to those of //. campesiris; pod oblong, acute at each end, 15-18 mm. 

 long, 4 mm. wide, strigose. 



Type locality: Colorado of the West [probably Ham's Fork, Wyoming]. 



Distribution: Wyoming and Utah; perhaps New Mexico. 



Illustrations: M. E. Jones. Rev. Astrag. pi. 3 (except the lower pod); pi. 42, f. 13 9. 



29. Homalobus strigosus (Coult. & Fisher) Rydb. Bull. Torrey Club 

 40:53. 1913. 



Astragalus strigosus Coult. & Fisher, Bot. Gaz. 18: 299. 1893. 

 Astragalus griseopubescens Sheldon, Minn. Bot. Stud. 1: 24. 1894. 

 Astragalus serotinus strigosus F. Macbr. Contr. Gray Herb. 65: 37. 1922. 



A perennial, with a cespitose caudex; stems 1.5-3 dm. high, strigose-canescent ; leaves 

 7-12 cm. long; upper stipules lanceolate, the lower triangular, scarious, connate, 3-4 mm. 

 long; leaflets 13-21, from lance-linear to narrowly linear, 1-3 cm. long, 1-3 mm. wide, acute at 

 each end, cinereous-strigose on both sides, often somewhat falcate; racemes lax, including the 

 peduncles 1-1.5 dm. long, 10-16-flowered; calyx strigose, the tube 2-2.5 mm. long, the teeth 

 subulate, 1.5 mm. long; corolla white or ochroleucous or tinged with purple, the keel purple- 

 tipped; banner S-10 mm. long, obovate; wings 6-7 mm. long, the blade obliquely oblanceolate, 

 much longer than the claw; blades of keel-petals lunate, 6-8 mm. long, with a lanceolate tip; 

 pod 18-20 mm. long, 3-3.5 mm. wide, linear, straight, acute at each end, strigose; seeds broadly 

 reniform-oblong, 2.5 mm. long, fully 1.5 mm. wide. 



Type locality: Basin, Montana. 



Distribution: Montana to eastern Washington and northern Wyoming. 



30. Homalobus tenuifolius Nutt.; T. & G. Fl. N. Am. 

 1:352. 1838. 



Astragalus campesiris Coult. & Nels. Man. 291. 1909; M. E. Jones, Rev. Astrag. 74. 1923. 

 Not A. campesiris L. 1753; nor A. campesiris A. Gray. 1866. 



A perennial, with a cespitose rootstock, branching near the surface; stems decumbent, 

 1-2 dm. high, strigose-canescent ; leaves 2-6 cm. long ; stipules lanceolate or the lower triangular, 

 scarious and connate; leaflets 7-11, narrowly linear, involute or folded, strigose-canescent on 

 both sides, S-15 mm. long, 1-2 mm. wide; racemes lax, including the peduncle 5-10 cm. long; 

 bracts subulate, 1-2 mm. long; calyx strigose, the tube 1.5-2 mm. long, the teeth triangular- 

 subulate, scarcely 1 mm. long; corolla ochroleucous or white, the keel purple-tipped; banner 

 6-7 mm. long, broadly obovate; wings falcate, 5-6 mm. long, the blade obliquely oblanceolate, 

 rounded at the apex, with an acute basal auricle, twice as long as the claw; keel-petals 5-6 mm. 

 long, the blades lunate, with a rather long lanceolate tip; pod oblong-linear, 12-15 mm. long, 

 2.5-3 mm. wide, strigose. 



Type locality: Hills of the Rocky Mountains [Wyoming or Idaho). 

 Distribution: Colorado. Wyoming, and Montana. 



Illustrations: M. E. Jones, Contr. W. Bot. 10: pi. 2 (except lower pod); Rev. Astrag. pi. 2, 

 f. a, c (as var. decumbens). 



