Part 7, 1929] FABACEAE: GALEGEAE 431 



39. Hamosa subuniflora (Greene) Rydb. Bull. Torrey Club 

 54: 328. 1927. 



Astragalus subuniflorus Greene, Leaflets 2: 42. 1910. 



An annual; stem branched at the base, 1-1.5 dm. high, strigose; leaves ascending, 4-6 cm. 

 long; stipules lance-subulate, 4-5 mm. long: leaflets 5-9, linear-oblanceolate or lance-linear, 

 5-13 mm. long, sparingly long-strigose on both sides, acute at each end; peduncles 4—7 cm. 

 long; racemes 1-2-flowered; bracts subulate, 1-2 mm. long; calyx strigose, the tube about 2 

 mm. long, the teeth subulate, 2 mm. long; corolla apparently white, 6 mm. long, similar to that 

 of H. Emoryana; pod arcuate, about 1.5 cm. long, 2 mm. wide and thick, glabrous, slightly 

 sulcate on the lower suture. 



Type locality: Near Tehuacdn, Puebla. 

 Distribution: Known only from the type locality. 



40. Hamosa imperfecta Rydb. Bull. Torrey Club 54: 329. 1927. 



An annual; stem branched at the base, decumbent, 2-3 dm. long, very sparingly strigose 

 straw-colored, terete; leaves 2-4 cm. long; stipules lanceolate, 2 mm. long; leaflets lance-oblong 

 or lance-linear, acute at each end, strigose beneath, glabrate above, 5-10 mm. long; peduncles 

 3-8 cm. long; racemes usually 2-flowered; bract subulate, 1 mm. long; calyx strigose, often 

 partly with black hairs, the tube less than 2 mm. long, the teeth subulate, of about the same 

 length; corolla apparently white, 5 mm. long; pod arcuate especially at the base, glabrous, 

 15-18 mm. long, 2 mm. broad, and 3 mm. deep, slightly sulcate on the lower suture, only 

 partially 2-celled, the partition very narrow; seeds 2.5 mm. long. 



Type locality: Rhyolite, Nye County, Nevada. 

 Distribution: Nevada, Arizona, and Lower California. 



41. Hamosa austrina Small, Fl. SE. U.S. 618, 1332. 1903. 



Astragalus Nuttallianus trichocarpus T. & G. Fl. N. Am. 1: 334. 1838. 



Astragalus trichocarpus M. J. Young, Fl. Tex. 228, in part. 1873. Not A. trichocarpus Wall. 1868. 



An annual; stem branched at the base, terete, strigose, 1-4 dm. long, often decumbent 

 in age; leaves 2-5 cm. long; stipules lanceolate, acuminate, 4-5 mm. long; leaflets of the lower 

 leaves mostly oval and obtuse, those of the upper elliptic or oblong or even linear and often 

 acute, strigose on both sides, 5-12 mm. long; peduncles 3-8 cm. long; racemes very short, 

 3-8-flowered; bracts lanceolate, 1 mm. long; calyx strigose, the tube about 2 mm. long, the 

 teeth 2-3 mm. long; corolla white or tinged with purple, 4-5 mm. long; banner obovate, retuse; 

 wings nearly as long, the blade obovate or oblanceolate, somewhat falcate, with a reflexed 

 auricle; keel-petals slightly shorter, the blade broadly lunate, acute or obtuse; pod strigose, 

 1.5-2 cm. long, 2 mm. wide and thick, arcuate towards the base, the cross-section cordate. 



Type locality - : "Rio Fronteras, Texas" [in reality Sonora].* 

 Distribution: Texas to Colorado, Utah, Lower California, and Durango. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 68. 



42. Hamosa pertenuis (Greene) Rydb. Bull. Torrey Club 

 54:329. 1927. 



Astragalus sp. Vasey & Rose, Contr. U. S. Nat. Herb. 1: 15. 1893. 



Astragalus cedrosensis Vasey & Rose, Contr. U. S. Nat. Herb. 1: 15, as synonym. 1893. 



Astragalus pertenuis Greene, Leaflets 2: 42. 1910. 



Astragalus Nuttallianus cedrosensis M. E. Jones, Rev. Astrag. 270. 1923. 



A slender annual; stem very slender, decumbent, 2-3 dm. long, branched at the base, 

 sparingly strigose, terete; leaves 2-5 cm. long, ascending; stipules lanceolate or subulate, 1-2 

 mm. long; leaflets of the lower leaves 2-7, cuneate or obovate, retuse at the apex, 3-5 mm. 

 long, those of the upper leaves oblong or linear, 5-10 mm. long, strigose beneath and usually 

 glabrate above; peduncles 3-6 cm. long; racemes 1-3-flowered; bracts lanceolate, 1 mm. long; 



* At the time of the Mexican Boundary Survey, there was a Frontera, Texas, near El Paso, 

 and also a Fronteras, Sonora. On the type sheet the state is not given, but it is on a duplicate sheet 

 as Sonora. 



