254 NORTH AMERICAN FLORA [Volume 24 



lanceolate in outline, 6-7 mm. long, 2.5-3 mm. wide, gradually tapering at the apex; beak 1 

 mm. long; seeds usually 2, brown, 3 mm. long, 1.5 mm. wide. 



Type locality: Homes Creek Valley, Nevada. 



Distribution: Western Colorado to eastern Oregon, Nevada, Arizona, and northwestern New 

 Mexico. 



Illustrations: M. E. Jones, Contr. W. Bot. 10: pi. 1; Rev. Astrag. pi. 5. 



3. Kentrophyta viridis Nutt.; T. & G. Fl. N. Am. 1: 353. 1838. 



Astragalus Kentrophyta A. Gray, Proc. Acad. Phila. 1863: 60. in part. 1863. 

 Astragalus viridis Sheldon, Minn. Bot. Stud. 1: 118. 1894. 

 Phaca viridis Britton, Mem. Torrey Club 5: 201. 1894. 



A perennial, with a densely cespitose caudex; stems much branched, 1-2 dm. long, strigose, 

 at first canescent; stipules united and scarious at the base, deltoid-subulate, partly green, 

 acuminate, 5-8 mm. long, the upper ones sometimes with a spinulose tip; leaves about 15 mm. 

 long, spreading, strigose but green; leaflets mostly 5, linear-subulate, spinulose-tipped, about 

 1 cm. long and 1 mm. wide, the midrib less prominent than in the preceding; peduncles 5 mm. 

 long or less, usually 2-flowered; calyx strigose, the tube 1.5-2 mm. long, the lobes subulate- 

 setaceous, 2-2.5 mm. long; corolla ochroleucous, 4—5 mm. long; pod ovoid, compressed, 4 mm. 

 long, 2 mm. wide. 



Type locality: Hills of the Platte, Nebraska or Wyoming. 

 Distribution: Wyoming, northern Colorado, and (?) western Nebraska. 



4. Kentrophyta montana Nutt.; T. & G. Fl. N. Am. 1: 353. 1838. 



Astragalus Kentrophyta A. Gray, Proc Acad. Phila. 1863: 60. 1863. 



Tragacantha montana Kuntze, Rev. Gen. 941. 1891. 



Homalobus montanus Britton, in Britt. & Brown, 111. Fl. 2: 306. 1897. 



Astragalus centrophyta Clements, Rocky Mt. Fl. 173. 1914. 



A stragalus montanus M. E. Jones, Rev. Astrag. 80. 1923. Not A . montanus L . 1753. 



A perennial, with a densely cespitose caudex; stems intricately branched, 1-1.5 dm., 

 rarely 2 dm. long, grayish-strigose ; stipules scarious, united half their length, deltoid, acu- 

 minate, 3-5 mm. long; leaves 1-1.5 cm. long; leaflets mostly 5, subulate, 1 cm. long, about 

 0.5 mm. wide, strigose, spinulose-tipped; peduncles very short, sometimes almost none; calyx 

 grayish-strigose, the tube 2 mm. long, the lobes subulate-filiform, 2 mm. long; corolla ochro- 

 leucous, nearly 5 mm. long; pod ovate, 4-5 mm. long, 2.5 mm. wide, the beak minute; seeds 2 

 mm. long, 1.5 mm. wide. 



Type locality: Hills of the Platte, Nebraska or Wyoming. 



Distribution: Saskatchewan and Alberta to New Mexico and western Nebraska. 

 Illustrations: M. E. Jones, Contr. W. Bot. 10: pi. 1; Rev. Astrag. pi. 5.f. 16; Britt. & Brown, 

 111. Fl./. 2152; ed. 2./. 2558; Fl. Neb. 21: pi. 11, f. 82-87 {as A. viridis); Am. Jour. Bot. IS: pi. 44 C. 



5. Kentrophyta ungulata (M. E. Jones) Rydb. Bull. Torrey 

 Club 51: 23. 1924. 



Astragalus Kentrophyta ungulatus M. E. Jones, Proc. Calif. Acad. II. 5: 650. 1895. 

 Astragalus montanus ungulatus M. E. Jones, Rev. Astrag. 80. 1923. 



A perennial, with cespitose caudex; stems densely branched, about 1 dm. long, densely 

 strigose-canescent; stipules scarious, ovate, pubescent, united nearly half their length, acu- 

 minate, 2-3 mm. long; leaves spreading, about 1 cm. long; leaflets subulate, 6-8 mm. long, 

 0.5-0.8 mm. wide, spinulose-tipped, strigose-canescent; peduncles very short, shorter than the 

 pedicels; calyx strigose-canescent, the tube 2 mm. long, the lobes subulate, 2 mm. long; corolla 

 ochroleucous, 5 mm. long; pods lanceolate in outline, more turgid than in A", montana, 6 mm. 

 long, 2.5 mm. wide, the beak about 1 mm. long. 



Type locality: Monitor Valley, Nevada. 

 Distribution: Nevada and western Utah (?). 

 Illustration: M. E. Jones, Rev. Astrag. pi. 5. 



