MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 249 



Somewhat resembling H. campestris,h\xt with a stipitate pod. 

 Montana: Ridge above Terminus, 1880, Watson, S8. 



* Homalobus stenophyllus (Torr. & Gray) ; Astragalus stenophyl- 



liis Torr. & Gray, FI. N. Am. i : 329, 

 Montana: Headwaters of Missouri, \V\cth. 



Homalobus vexiliflexus (Sheld.) ; Astralagus -paucifforus Hook. Fl. 



Bor. Am. i : 149 [Man. R. M. 68] ; not Pall. ; Astragalus vexili- 



jlexus Sheldon, Bull. Geol. & Nat. Hist. Surv. Minn. 9: 27. 



Mountain sides, on plains in loose soil, at an altitude of 1500- 

 2000 m. 



Montana: Cottonwood Creek, 1896, Flodman, 64.J ; Bridger 

 Mts.,Junei4, 1897, Rydhcrg & Bcsscy, 44S6 ; Bozeman, 1887, 

 Tweedy, ij8; 1892, Mrs. Aldcrson; John Pearsall, 81 j; Deep 

 Creek, 1891, R. S. Williams, 102; Flathead River, 1883, Canby, 

 82; Bozeman, 82; Fort Ellis to the Yellowstone, 1891, R. Adams; 

 Madison, 1883, Scrihner, 2yo; Shield's River, ^7. 



* Homalobus aculeatus (A. Nelson) ; Astragalus aculcatus A. Nel- 



son, Bull. Torr. Bot. Club, 26: 10. 



Related to H. tegitarius {^Astragalus tegitarius Wats.) and H. 

 montantis (Nutt.) Britt. (yl. Kentrofhyta Gray), but differs from 

 both in its dark purple flowers. From H. implcxus (^A. tegi- 

 tarius implexus Canby) it differs in the greater size and scantier 

 pubescence. On high mountains, at an altitude of 2500-3500 m. 



Montana : Cedar Mts., June 16, 1897, Rydberg & Bessey, 448 j ; 

 Beaver Head Co., 1888, Tzvecdy, 10; Lake Plateau, 1897, P. 

 Koch, 60. 



Yellowstone Park: 1884, F. Tzceedy, 8j ; Mammoth Hot 

 Springs, 1885,5^^; Lower Geyser Basin, Aug. 4, 1897, Rydberg 

 (S: Bessey, 4488; Hoodoo Peak, 1897,/^. Koch,ij; Grand Canon, 

 1872, Coulter. 



Homalobus caespitosus Nutt. ; Torr. & Gray, Fl. N. Am. i : 352 



[Bl. Fl. 2 : 306] ; Astragalus caespitosus Gray, Proc. Am. Acad. 



6: 230. 



On drv hills, at an altitude of 1000-2000 m. 



Montana: White Beaver Creek and Park Co., 1889,7^. Tzveedy ; 

 Grafton, 1888, R. S. Williams, ij ; Snowy Mts., 1882, Canby. 



Orophaca caespitosa (Nutt.) Britton; Britt. & Brown, HI. Fl. 2: 

 306 ; Phaca caespitosa Nutt. Gen. 2 : 98 ; Astragalus triphyllus 

 Pursh, Fl. Am. Sept. 740 [Man. R. M. 69] ; not Pall. 



