MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 405 



On dry hills, at an altitude of 1500-2500 m. 



Montana: JVutlall ; Gallatin Co., 1887, Tzveedy, jyj and j/j; 

 East Boulder, 1887,^70; Beaver Head Co., 1888, 2J3 ; Old Hol- 

 lowtop. Pony, July 7, 1897, Rydberg & Bessey, sojg; Great Falls, 

 1891, 7?. S. Williams; Bozenian, 1887, Tzuccdy, jyj ; Great Falls, 

 1885, J^. W. Andersoiiy 2ig; Mt. Helena, 1883, Canby, 181; 

 Fort Logan, 1882, Canby ; Bozeman, 1895, Rydberg^ 2826; Cot- 

 tonwood Creek, 1896, Flodman, 844.; Elk Mts., 84^. 



Yellowstone Park: 1887, Dr. Chas. H. Hall; Mammoth Hot 

 Springs, 1884, Tzveedy, 128. 



Idaho: Mt. Chauvet, July 21, 1897, Rydberg & Bessey, jO'/8. 



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



JDiplopappiis cancscens Hook. Fl. Bor. Am. 2: 21; Erigeron 



canesccns Torr. and Gray, Fl. N. Am. 2: 179; not Willd. 



Like E. caespitostis, but taller, 2—3 dm. high, with thinner pubes- 

 cence, narrower bracts and leaves, and smaller heads. 



Montana: Spanish Basin, 1896, Elodman, Sj6. 



Erigeron corymbosus Nutt. Trans. Am. Phil. Soc. (H.) 7: 308 



[Syn. Fl. I-: 214; Bot. Cal. i: 329; Man. R. M. 172]. 



On dry hills and plains, at an altitude of 1000-2500 m. 



Montana: Columbia Falls, Mrs. J. J. Kennedy, i; Bozeman, 

 1887, Tzveedy, j66; Grizzly Creek, jd^; Pony, July 6, iSgJ, Ryd- 

 berg d^ Bessey, J080; Jack Creek, July 15, JOcS"/ ,• Trout Creek, 

 1891, R. S. Williams; Centerville, 1883, Scribner, loid; Lima, 

 1895, Rydberg, 2821. 



Yellowstone Park: Specimen Ridge, 1885, Tzveedy, jo^. 



* Erigeron Scribneri Canby, Bot. Gaz. 15: 150. 



In habit it most resembles E. Parryi, but is not at all hirsute, and 

 the involucral bracts are different and more imbricated. The char- 

 acters of the head, although much smaller, indicate a close relation- 

 ship with E. Monfanensis, from which it is easily distinguished by 

 the smaller size and the habit. 



Montana: Litde Belt Mountain, 1883, Scribner, yj, in part. 



* Erigeron Montanensis Rydb. Bull. Torr. Bot. Club, 24: 296; 



Erigeron Tzveedyana Canby & Rose, Bot. Gaz. 15 : 65 ; not E. 

 Tweedy i Ca.nhy, Bot. Gaz. 13: 17. 



Professor Aven Nelson suggests that this species should perhaps 

 be included in his new genus Wyomingia. If so, some of the other 



