246 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



In sandy soil, at an altitude of about 2000 m. 



Montana: Ellison, 1889, F. D. Kelsey ; Silver Bow Co., \\ 

 Tweedy^ 11; Garrison, iS(^^, Rydberg; Little Blackfoot River, 

 1883, Canby, 80; Hell Gate Canon, 1880, Watson. 



* Phaca platytropis (Gray) ; Astragalus flatytropfs Gray, Proc. 



Am. Acad. 6: 526 [Bot. Cal. i: 147]. 



A tufted silvery-silky nearly stemless species, with scape-like 

 peduncle, yellowish-white flowers, and ovoid sometimes mottled pod. 

 Montana: Glen, Beaver Head Co., 1888, Tweedy, 201. 



* Phaca inepta (Gray); Astragalus ineptus Gray, Proc. Am. Acad. 



6: 525- 



Although the pod is more or less completely 2-celled and therefore 

 does not agree with the description of Phaca, it should undoubtedly 

 be referred to that genus rather than to Astragalus. The pod is 

 papery, inflated, and mottled as in most species of Phaca, and the 

 habit is exactly that of many of them. The whole section of 

 Diphysi show more relationship to the true Phacac than to typical 

 Astragali. The intrusion of the dorsal suture is scarcely of generic 

 value, as it varies in depth even in the same species. 



Montana: Lima, Aug. 5, 1895, Shear, jj8 ; Pydbcrg, 26^8; 

 Beaver Head Co., 1888, P. Tzuccdy, 20J. 



Homalobus aboriginorum (Richards) ; Astragalus aboriginoruju 



Richards. Frankl. Journ. App. 746 [Man. R. M. 63 ; 111. Fl. 2: 



303] ; Phaca ahorigi)ioruui Hook. Fl. Bor. Am. i : 143. 



Although the dorsal suture is slightly inflexed, the pod in this 

 species and the next is flat and both sutures are prominent, with no 

 indication of being at all sulcate on the dorsal side. As the habit 

 is like the t3^pical species of Hoftialobus, the two species should 

 rather be referred to that genus. //. aboriginorum grows on moun- 

 tain sides, at an altitude of 1500-3000 m. 



Montana: Little Belt Pass, 1895, Flodnian, 62S ; Cedar Moun- 

 tain, July 16, 1897, Rydbero & Bcsscy, 4482; Sweetwater Basin, 

 1888, Tzc'ccdy, 20s (in part) ; Belt Mts., 1887, 7?. S. Williams, pj. 



Yellowstone Park: Mt. Washburn, 1884, Tzcccdy, yi; Soda 

 Butte Creek, 1885, jjj. 

 Homalobus glabriusculus (Gray); Astragalus glabriusculus Gray, 



Proc. Am. Acad. 6: 204 [Man. R. M. 6^]. 



On mountain sides, especially in open woody places, at an altitude 

 of 1500-2500 m. 



