Sheldon: species of astragalus. 175 



X>eduncles 10 to 15 cm. in length, loosely subspicately twelve to 

 fifteen flowered; Jlowers 12 to 15 mm. in length becoming 

 deflexed; calyx broadly campanulate, the filiform, spreading 

 teeth three fourths the length of the tube; coroZZa ochroleucous, 

 tinged with green: legume 2 to 2.75 cm. in length, short-ovate, 

 sessile, coriaceous, glabrous, finely transversely rugose veined, 

 unilocular, with both sutures intruded, so as to become nearly 

 bilocular, eight to ten seeded. 



Collected in New Mexico, 1877, by Professor J. T. Rothrock; 

 also at Wabash ranch, eastern Arizona, July, 1892, by Pro- 

 fessor E. O. Wooton. 



A.roihrockii is most peculiar among North American species 

 of the genus. In size and general appearance it is like A. iex- 

 amis Sheld., but its more minute characters seem to place it 

 with A. diphysus A. Gray, although that species is completely 

 bilocular. It would form a good connecting link between the 

 two above species in a diagrammatic classification of the species 

 of Astragahis. The species is named for Professor J. T. Roth- 

 rock of the University of Pennsylvania, who first collected the 

 plant. 



