406 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



species, as, for instance, E. Parryi^ E. cacspitosus, E. cory7nbosiis, E. 

 tejier, E. esperifolncs, and E. canus, might have to be included also, 

 as they have broad rays, the same habit and the bracts approach 

 those of Wyomingia. If any of these species are to be included, the 

 generic description must be modified. I, therefore, retain this 

 species as well as the rest in Eri'geron until, after further study, it 

 may be possible to better limit his genus. E. Montanensis is charac- 

 terized by its broad white (or straw-colored) rays, white-woolly 3-4 

 serial bracts, and linear leaves. It grows on dry hills, at an altitude 

 of 2000—2500 m. 



Montana : Bridger Mountains, June 12, 1897, Rydberg& Bessey^ 



S072; Great Falls, 1886, R. S. Williams, 34s ^ ^^^ Mountains, 



1896, Flodman, Sjy ; Little Belt Pass, 8j8 ; Little Belt Mountains, 



1883, Scribne?-, ■/■/ ; Park Co., 1888, Tweedy; Billings, 1882, 



Canby. 



Erigeron decumbens Nutt. Trans. Am. Phil. Soc. (II.) 7: 309 [Syn. 

 Fl. i' : 215 ; Man. R. M. 173] . 

 Montana : According to Gra\% 



Erigeron Philadelphicus L. Sp. PI. 863 [111. Fl.'a: 388; S^m. FL 



i^: 217; Bot. Cal. i: 331; Man. R. M. 172]. 



In wet meadows, perhaps reaching an altitude of 1000 m. 



Montana : Columbia Falls, Airs. J. J. Kennedy, 2 and ^; 1892, 

 E. S. Williams , gj^. 



* Erigeron oblanceolatus Rydb. Bull. Torr. Bot. Club, 24: 294. 



May be nearest related to E. P/iiladclphicus, but it has narrowed 

 oblanceolate acute leaves, with a few sharp teeth. The heads are 

 fewer and larger, resembling those of E. speciostis. It grows in 

 wet meadows, at an altitude of 1000-2500 m. 



Montana : Helena, 1889, E. D. Kelsey ; Beaver Head Co., 1888, 

 Tweedy 16 (depauperate) ; Silver Bow Co., 31rs. Jennie II. Moore; 

 Spanish Basin, July 24 and 28, 1897, Rydberg & Bessey, jo^y and 

 ^og8 (depauperate); Great Falls, 1891, R. S. Williams, J04.. 



Erigeron divergens Torr. & Gray, Fl. N. Am. 2: 175 [111. Fl. 3: 



388; Syn. Fl. I-: 218; Bot. Cal. i: 331; Man. R. M. 173]. 



In meadows, at an altitude of 1500-2500 m. 



Montana: Park Co., 1887, E. Tweedy, 372. 



Yellowstone Park : Upper Geyser Basin, Aug., 1897, Rydberg 

 & Bessey, 3076. 



