74 BOTAHY. 



Astragalus nudus. Perennial, somewhat hoary with a minute pubes- 

 cence ; stems numerous, ascending, branched, flexuous ; stipules ovate-acu- 

 minate, the lower ones adnate to the petioles ; leaflets i-V long, 1-2 pairs, 

 linear, distant upon a long (4-6') angular rachis; peduncles equaling the 

 leaves; flowers (6-8) distant; corolla violet-purple, 9-12" long, twice 

 longer than the cylindrical calyx ; calyx-teeth lanceolate, not half the length 

 of the tube ; legume S-1' long, sessile, erect, thick, cartilaginous, glabrous, 

 oblong-ovate, inflated, not sulcate, the sutures thick and prominent and not 

 intruded, 1-celled, many-seeded. — Very near A. pectinatus, but distinguished 

 by its erect and somcM'hat larger legumes, its few loosely-racemed blue 

 flowers, and sparse short leaflets. West Humboldt Mountains, Nevada; 

 5,000 feet altitude; May, June. (280.) 



Astragalus Chamjsleuce, Gray ; I. c, 222. Perennial, silvery-canes- 

 cent with a dense silky pubescence ; stems numerous, short, (1-6',) prostrate, 

 or nearly acaulescent ; stipules ovate, membranous, free ; leaflets 2-4" long, 

 2-6 pairs, oblong, obovate or oval ; peduncles shorter than the leaves, slender, 

 3-8-flowered ; calyx-teeth subulate, much shorter than the cylindrical tube ; 

 corolla light violet, f long ; legume J- 1' long, thick-coriaceous, sessile, ovate- 

 oblong, acuminate, somewhat arcuate, terete or somewhat obcompressed 

 and frequently sulcate ventrally, rugosely reticulated and subpubescent, 

 1-celled, many-seeded. — From Arizona and New Mexico to Southern Idaho, 

 (Burke.) Found in Ruby Valley, Nevada, and in the Wahsatch Mountains 

 and Bear River Valley, Utah; 6-7,000 feet altitude; June, July. The pres- 

 ent specimens have more numerous and narrower leaflets than usual. (281.) 



Astragalus speirocarpus, Gray ; I. c, 225. Perennial, somewhat cine- 

 reous with a minute pubescence ; stems 1-2° long, numerous, decumbent, 

 simple or branched ; stipules small, ovate-lanceolate, nearly free ; leaflets 4-9 

 pairs, 3-6" long, obovate or oblong, retuse ; racemes loose, secund, rather 

 few-(10-20-)flowered ; flowers 10" long, ochroleucous, keel spurred ; the 

 cylindrical calyx-tube several times longer than the rather short teeth ; legume 

 1-1 i' long, coriaceous, exsertly stipitate, flattened, glabrous, linear-lanceo- 

 late, spirally coiled, perfectly 1-celled, many-seeded. — The legumes in these 

 specimens are much thinner and less rugose than in Lyall's, the sutures not 

 thickened nor showing any tendency to separation. On the Upper Colum- 

 bia, (Lyall.) On the Trinity, Pah-Ute and Toyabe Mountains, Nevada; 

 6,000 feet altitude ; May-July. (282.) 



