Part 7, 1929] FABACEAE: GALEGEAE 425 



19. Hamosa Paysonii Rydb. Bull. Torrey Club 54: 22. 1927. 



A perennial, with a woody eaudex; stems many, about 5 dm. high, glabrous or nearly 

 so, striate, light-green; leaves ascending, 7-10 cm. long; stipules deltoid, 3-4 mm. long; leaflets 

 ovate or oval, deeply notched at the apex, 10-17 mm. long, 4—10 mm. wide, glabrous above, 

 strigose beneath; peduncles 5-10 cm. long, erect; racemes 4—5 cm. long; bracts lance-subulate, 

 2 mm. long or less; calyx black-hairy, the tube 2.5-3 mm. long, the teeth subulate, 2 mm. 

 long; corolla white, 6-S mm. long; banner obovate, rather abruptly arched; wings shorter, the 

 blade rather broad, elliptic; keel-petals shorter, broadly lunate, rounded at the apex; pod 

 (immature) oblong, tapering at each end, 2 cm. long, 3 mm. wide and thick, strigose, the 

 cross-section somewhat cordate. 



Type locality: Horse Creek, seven miles west of Merna. Sublette County, Wyoming. 

 Distribution: Known only from the type locality. 



20. Hamosa albens (Greene) Rydb. Bull. Torrey Club 

 54:22. 1927. 



Astragalus albens Greene, Bull. Calif. Acad. 1: 156. 1885. 



A perennial, with a deep root and short eaudex; stems many, decumbent or spreading, 

 2-5 dm. long, strigose with white hairs, flexuose; leaves 3-6 cm. long, spreading; stipules deltoid, 

 3-4 mm. long, sparingly strigose; leaflets 7-11, broadly obovate, 5-10 mm. long, silvery on 

 both sides, mostly rounded at the apex; peduncles 3-5 cm. long; racemes elongate, about as 

 long; bracts subulate, 1 mm. long; pedicels 1-1.5 mm. long; calyx silvery, the tube 2 mm. 

 long, the teeth subulate, 1 mm. long; corolla purple, about 8 mm. long; banner broadly obovate, 

 abruptly arcuate; wings shorter, the blade obliquely oblanceolate; keel-petals nearly as long 

 as the banner, the blade very broad, strongly arcuate at the rounded apex; pod arcuate, silvery, 

 acute at each end, 1.5-2 cm. long, about 3.5 mm. wide, and 2 mm. thick, white-strigose, deeply 

 sulcate on the lower suture, narrowly cordate in cross-section. 



Type locality: Mohave Desert. 

 Distribution: Mohave and Colorado deserts. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 66, f. 227. 



21. Hamosa arizonica (A. Gray) Rydb. Bull. Torrey Club 

 54:22. 1927. 



Astragalus arizonicus A. Gray. Proc. Am. Acad. 7: 398. 1868. 

 Tragacantha arizonica Kuntze, Rev. Gen. 943. 1891. 



A perennial; stems white-strigose, procumbent or prostrate, flexuose, 2-5 dm. long; 

 leaves ascending, 6-10 cm, long; stipules deltoid, about 3 mm. long; leaflets 9-17, linear or 

 oblong, mostly acute, 1-3 cm. long, 2-3 mm. wide, silky-canescent on both sides; peduncles 

 5-15 cm. long; racemes elongate, 3-8 cm. long; calyx white-strigose, rarely with some black 

 hairs, the tube 4 mm. long, the teeth subulate, with a deltoid base, 2 mm. long; corolla white, 

 about 1 cm. long; banner obovate; wings slightly shorter, the blade oblong, falcate, obtuse, 

 with a reflexed auricle; keel-petals slightly longer, broadly lunate, strongly arcuate near the 

 slightly produced but blunt tip; pod linear, 2-4 cm. long, slightly arcuate, strigose, slightly 

 sulcate on the lower suture, cuneately cordate in cross-section. 



Type locality: Near Camp Grant, Arizona. 

 Distribution: New Mexico, Arizona, and Sonora. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 65, f. 218. 



22. Hamosa Coahuilae (M. E. Jones) Rydb. Bull. Torrey Club 

 54:23. 1927. 



Astragalus Coahuilae M. E. Jones, Rev. Astrag. 256. 1923. 



A perennial, somewhat woody at the base; stem much branched, especially at the base, 

 3-6 dm. high, canescent with short kinked hairs; leaves 4-8 cm. long, ascending; stipules deltoid, 

 3-5 mm. long; leaflets 9-23, elliptic or oblong, obtuse, 6-12 mm. long, canescent with short 



