398 NORTH AMERICAN FLORA [Volume 24 



36. Tium amplexum (Payson) Rydberg. 



Astragalus amplexus Payson, Bot. Gaz. 60: 378. 1915. 

 Hamosa amplexa Rydb. Fl. Rocky Mts. 496. 1917. 



A perennial or biennial; stems several from the taproot, 3-4 dm. high, sparingly strigose, 

 striate or somewhat sulcate, flexuose, more or less tinged with purple; leaves 8-12 cm. long, 

 spreading; stipules deltoid, nearly distinct, 3-4 mm. long; leaflets 17-21, obovate or oblance- 

 olate, rounded, truncate, or retuse at the apex, 9-12 mm. long, 4-6 mm. wide, glabrous above, 

 sparingly strigose beneath; peduncles 4—5 cm. long; racemes 3-6 cm. long, 12-15-flowered; 

 bracts lanceolate, 3 mm. long; pedicels in fruit reflexed; calyx strigose, more or less black', the 

 tube 6 mm. long, 3 mm. broad, the teeth subulate, 2-3 mm. long; corolla pale- violet, 2 cm. long; 

 banner obovate, slightly arcuate; wings nearly as long, the blade broadly oblong; keel-petals 

 shorter, the blade broadly lunate; pod sessile, sparingly pubescent, coriaceous, 2-2.5 cm. long, 

 6 mm. wide, subterete, more or less arcuate, mottled with purple. 



Type locality: Long Park, near Naturita, Colorado. 

 Distribution: Known only from the type locality. 



37. Tium Wilsoni (Greene) Rydberg. 



Astragalus Wilsoni Greene, Pittonia 3: 196. 1897. 



A perennial, with a woody root; stems several, striate, glabrous, 3-5 dm. high, often 

 purplish with small white dots; leaves 8-10 cm. long, ascending or spreading; stipules deltoid, 

 5-7 mm. long; leaflets 19-25, oval or obovate, acute at the base, rounded at the apex, rather 

 firm, 10-18 mm. long, 5-8 mm. wide, glabrous or nearly so on both sides; peduncles 5-8 cm. 

 long; racemes rather dense, 3-6 cm. long; bracts lanceolate, 3 mm. long, sparingly hairy; pedi- 

 cels ascending, about 2 mm. long; calyx sparingly white-hairy, the tube 6 mm. long, the teeth 

 subulate, 3 mm. long; corolla white, 15—16 mm. long; banner obovate, moderately arcuate; 

 wings nearly as long, the blade oblong, falcate; keel-petals shorter, the blade broadly lunate, 

 rounded at the apex; pod oblong, acute at each end, glabrous, 2-2.5 cm. long, 6 mm. thick, 

 and 5 mm. wide, mottled, somewhat sulcate on the upper suture. 



Type locality: Northern Arizona. 

 Distribution: Arizona. 



38. Tium ursinum (A. Gray) Rydberg. 



Astragalus ursinus A. Gray, Proc. Am. Acad. 13: 367. 1878. 



A perennial; stems 3-4 dm. high, flexuose, slightly grooved, strigose; leaves 6-10 cm. long, 

 spreading; stipules deltoid, 5 mm. long, distinct, herbaceous; leaflets 13-19, obovate, acute 

 at the base, rounded to slightly retuse at the apex, 5-10 mm. long, glabrous on both sides or 

 slightly strigose beneath, especially on the midrib; peduncles 4-6 cm. long; racemes lax, 4-6 

 cm. long; bracts lanceolate, 1.5-2 mm. long; calyx sparingly strigose, with black and white 

 hairs mixed, the tube 4 mm. long, the teeth subulate, 1 mm. long; banner narrowly obovate, 

 moderately arcuate; wings shorter, the blade oblong; keel-petals much shorter, the blade 

 broadly lunate; pod ascending on an ascending pedicel, leathery, subterete, gradually acute, 

 1—1.5 cm. long, 4 mm. wide, glabrous. 



Type locality: Bear Valley, Utah. 

 Distribution: Known only from the type locality. 



39. Tium mokiacense (A. Gray) Rydberg. 



Astragalus mokiacensis A. Gray, Proc. Am. Acad. 13: 367. 1878. 

 Astragalus lentiginosus mokiacensis M. E. Jones, Rev. Astrag. 126. 1923. 



A biennial or perennial (?); stem erect, fleshy, striate, more or less strigose, sometimes 

 canescent when young; leaves about 1 dm. long; stipules deltoid, 4-5 mm. long, reflexed, 

 membranous; leaflets 11-17, obovate, retuse, sparingly strigose, or in age glabrate, 1-2 dm. 

 long; racemes rather lax, 7-16 cm. long; bracts lanceolate, 2-3 mm. long; calyx strigose with 

 blackish hairs, the tube about 5 mm. long, the teeth subulate, 2-2.5 mm. long; corolla pink- 



