434 NORTH AMERICAN FLORA [Volume 24 



long, 2-4 mm. wide, glabrous above, strigulose beneath, truncate, rounded, or retuse at the 

 apex; racemes 10-15 cm. long; rachis black-hairy; bracts lanceolate, 2 mm. long; flowers re- 

 flexed; calyx black-hairy, the tube 2 mm. long, the teeth lanceolate, 1 mm. long; corolla white, 

 about 6 mm. long; banner obovate, strongly arcuate, retuse at the apex; wings somewhat 

 shorter, the blade broadly elliptic ; wing-petals still shorter, the blade broadly lunate, rounded 

 at the apex; pod linear-oblong, arcuate, about 12 mm. long, 4 mm. wide, and 2.5 mm. thick, 

 acute at each end, minutely strigulose, broadly cordate in cross-section. 



Type locality: Dublan, Hidalgo. 

 Distribution: Hidalgo and Zacatecas. 



49. Hamosa Hartwegii (Benth.) Rydb. Bull. Torrey Club 

 54:333. 1927. 



Astragalus Harlwegii Benth. PI. Hartw. 10. 1839. 

 Tragacanlha Harlwegii Kuntze, Rev. Gen. 945. 1891. 



A perennial; stem 3-6 dm. high, sparingly strigose, striate, flexuose; leaves spreading, 

 6-8 cm. long, acuminate; leaflets 15-21, oblong or oblanceolate to nearly linear, 6-15 mm. 

 long, acute at the base, obtuse at the apex, glabrate above, strigose beneath ; peduncles 5-10 cm. 

 long; racemes 4—8 cm. long, rather dense; bracts lanceolate, 2 mm. long; flowers nearly sessile, 

 reflexed; calyx white-strigose, the tube 2 mm. long, the teeth deltoid, less than 1 mm. long; 

 corolla white or ochroleucous, 5-7 mm. long; banner broadly obovate, strongly arched at the 

 middle; wings as long, the blade broadly obovate; keel-petals shorter, the blade semiorbic- 

 ular; pod obliquely lance-oblong, slightly arcuate, 12-15 mm. long, 3 mm. wide and as thick, 

 white-strigulose, the cross-section inversely V-shaped. 



Type locality: Aguascalientes. 

 Distribution: Coahuila to Sonora and Mexico. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 70, f. 256. 



50. Hamosa vaccarum (A. Gray) Rydb. Bull. Torrey Club 



54: 334. 1927. 



Astragalus vaccarum A. Gray, PI. Wright. 2: 43. 1853. 

 Astragalus Daleae Greene, Pittonia 1: 153. 1888. 

 Tragacanlha vaccarum Kuntze, Rev. Gen. 949. 1891. 



A perennial; stems slender, 2-5 dm. high, sparingly strigose; leaves ascending, 4-10 cm. 

 long, the rachis strigose; stipules lanceolate, 4—5 mm. long; leaflets 9-19, linear or oblong, 5-20 

 mm. long, 1.5-3 mm. wide, glabrous above, strigose beneath, mostly obtuse at the apex; 

 peduncles 5-9 cm. long; racemes elongate, many-flowered, 4—8 cm. long; bracts subulate, 1-2 

 mm. long; pedicels less than 1 mm. long; flowers drooping; calyx white-hairy, the tube cam- 

 panulate, 1.5 mm. long, the teeth subulate, less than 1 mm. long; corolla ochroleucous, similar 

 to that of the preceding, but smaller, only 4-5 mm. long, and the banner more strongly arched; 

 pod strongly falcate, minutely white-hairy, scarcely 1 cm. long, 1.5 mm. wide, and 2 mm. thick, 

 cordate in cross-section. Scarcely distinct from //. Harlwegii. 



Type locality: Ojo de Vaca, west of the Copper mines, New Mexico. 

 Distribution: New Mexico to Sonora and Durango. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 70, f. 259. 



51. Hamosa Clevelandi (Greene) Rydb. Bull. Torrey Club 



54: 334. 1927. 



Astragalus Clevelandi Greene, Bull. Torrey Club 9: 121. 1882. 



A perennial; stem 4-10 dm. high, striate, glabrous, straw-colored; leaves spreading, 6-10 

 cm. long; stipules 4—5 mm. long, lanceolate, acuminate; leaflets 15-21, oblong, 1-2.5 cm. long, 

 2-5 mm. wide, glabrous above, strigose beneath, obtuse or acute; peduncles about 1 dm. long; 

 racemes elongate, lax, 1-1.5 dm. long; bracts lanceolate, 1-2 mm. long; calyx sparingly white- 

 strigose, the tube 1.5 mm. long, the teeth lanceolate, 1 mm. long; corolla 4-5 mm. long, ochro- 

 leucous; banner broadly obovate, strongly arcuate; wings slightly shorter, the blade strongly 



