430 NORTH AMERICAN FLORA [Volume 24 



about 2 mm. wide, emarginate or truncate at the apex, euneate at the base, glabrous above, 

 grayish-strigose beneath, rather thick; peduncles 3-5 cm. long; racemes very short, 4-8-fiowered ; 

 bracts lanceolate, 1-2 mm. long; calyx strigose, the tube 2 mm. long, the teeth lance-subulate, 

 2 mm. long; corolla purplish, 7-8 mm. long; banner broadly obovate, notched at the apex; 

 wings about as long, the blade broadly oblanceolate, obtuse, with a reflexed auricle; keel- 

 petals shorter, broadly lunate, abruptly incurved at the obtuse apex; pod glabrous, slightly 

 and evenly arcuate, acute at each end, 1-1.5 cm. long, 3 mm. wide. 



Type locality: Monterey, Nuevo Le6n. 

 Distribution: Known only from the type locality. 



36. Hamosa macilenta Small, Fl. SE. U.S. 618, 1332. 1903. 



A slender annual; stem sparingly strigose, often branched at the base, 1-2 dm. high; 

 leaves ascending, 5-7 cm. long; stipules lanceolate, 3-4 mm. long; leaflets 11-19, linear 

 or oblong, acute or obtuse, 4-12 mm. long, 1-3.5 mm. wide, sparingly pilose-strigose on both 

 sides or glabrate above; peduncles 3-7 cm. long; racemes 2-3 mm. long; bracts lance-subulate, 

 2 mm. long; calyx strigose, the tube about 2 mm. long, the teeth subulate, 2 mm. long", corolla 

 about 1 cm. long; banner purplish, obovate, retuse at the apex; wings apparently white or 

 yellowish, the blade broadly oblanceolate, obtuse; keel-petals purple-tipped, the blade broadly 

 lunate, rounded at the apex; pod glabrous, decidedly arcuate at the base, 2.5 cm. long, 2 mm. 

 wide and thick, sulcate on the lower suture. 



Type locality: Rio Blanco, Texas. 

 Distribution: Texas. 



37. Hamosa Emoryana Rydb. Bull. Torrey Club 54: 327. 1927. 



Astragalus NuUallianus var. A. Gray, PI. Wright. 1: 52. 1852. 



Astragalus NuUallianus var. [no. 1 and no. 2, in part| A. Gray, PI. Wright 2: 43. 1853. 



Astragalus NuUallianus Jepson. Man. Fl. PI. Calif. 579, mainly. 1925. 



An annual; stem 1-3 dm. high, erect or decumbent below, branched at the base; leaves 

 3-5 cm. long, ascending; stipules lanceolate, 2-4 mm. long; leaflets 9-17, elliptic or oblong, 

 obtuse or those of the upper leaves lance-oblong and acute, 2-10 mm., rarely up to 12 mm. 

 long, strigose on both sides; peduncles 2-8 cm. long; racemes short, 3- 1 0-flowered ; bracts 

 subulate, 2 mm. long; calyx strigose, the tube 2 mm. long, the teeth subulate, about as long; 

 corolla purple-tipped; banner obovate, retuse, 6-7 mm. long; wings 5-6 mm. long, the blade 

 oblanceolate, with a reflexed auricle; keel-petals shorter, broadly lunate, acutish; pod glabrous, 

 linear, 2 cm. long, 3 mm. wide and thick, arcuate throughout, but more strongly so towards 

 the base, cordate in cross-section. 



Type locality: El Paso, Texas. 



Distribution: Western Texas to southeastern California, Chihuahua, and Coahuila. 



38. Hamosa davisiana (Greene) Rydb. Bull. Torrey Club 

 54: 328. 1927. 



Astragalus davisiana Greene; Rydb. Bull. Torrey Club 54: 328, as synonym. 1927. 



An annual or perhaps perennial; stem branched at the base, decumbent, 1-1.5 dm. long, 

 terete, hoary-canescent ; leaves 2-3 cm. long, spreading; stipules ovate, acuminate, 4 mm. long; 

 leaflets 11-15, oval or elliptic, 2-5 mm. long, hoary-canescent with ascending or spreading 

 hairs; peduncles 1-3 cm. long; bracts lance-subulate, about 2 mm. long; calyx hirsute, the tube 

 2 mm. long, the teeth subulate, nearly as long; corolla apparently white, 7-8 mm. long, similar 

 to that of H. Nuttalliana; pod uniformly arcuate, 12-18 mm. long, 2.5 mm. wide and thick, 

 glabrous, strongly reticulate, cordate in cross-section. 



Type locality: Davis Mountains, Texas. 

 Distribution: Known only from the type locality. 



