28 MEMOIRS OF THE ^E\V YORK BOTANICAL GARDEN. 



Mts., near Black Hawk, Aug. 5, 1896, Flodmau^ jS and jp; Trout 

 Creek, 1891, 7?. S. Williams, 8jj ; Silver Bow Co., 1888, Tzueedy, 

 ijj ; 1883, Scribner, 333; Spanish Basin, 1896, Rydberg^ 3043; 

 Elk Mountains, 3268; July 26, 1897, Rydbcrg dr Bcsscy, 3362; 

 Rock Creek, Belt Mts., 1883, Scrihner^ 333: Helena, 1883, Canby, 

 334: Big Hole Valley, 1880, Watson. 



Yellowstone Park: Mirror Lake, 1885, Tzcccdy, 3Q1 : East 

 Fork of Yellowstone, 38 1 . 



Sporobolus cuspidatus (Torr.) Wood, Bot. & Florist, 385 [Man. R. 



M. 411 : 111. Fl. I : 153] ; ^il/a ciispidata Torr. ; Hook. Fl. Bor. 



Am. 2 : 23S, 



This is a grass that belongs to the plain and prairie regions, and in 

 Montana scarcely reaches the foot of the mountains. 



Montana: 1883, Scribncr, 330. 



Sporobolus brevifolius (Nutt.) Nash, Bull. Torr. Bot. Club, 22: 

 464 ; not Scribn. [111. Fl. i : 153] ; Agyos/is brcvifolia Nutt. i : 

 44; Sporohohis dcpaiipcratiis Coulter, Man. 411, in part. 

 Rather common in meadows, at an altitude of 1500-2000 m. 

 Montana: Manhattan, 1895, Shear, 410: Rydbcrg, 2iyi : Dillon, 

 Shear, 333: Rydberg; 2081; Melrose, Shear, 342: Rydbcrg, 

 2og3 ; Madison River, Shear, 324: Rydbcrg; 22 j6: Yogo Baldy, 

 Little Belt Mts., 1896, Flodman, 68; Long Baldv, Aug. 19, jo; 

 Spanish Basin, July 20, 6j ; Helena, 1892, F. D. Kclscy : 1883, 

 Scribncr, 331; Forks of Madison, July 26, 1S97, Rydberg tt- Bcs- 

 scy, 3364; Spanish Basin, 1896, Rydbcrg, 3162 and 3166: Judith 

 River, 1896, Rydberg; 3430; Musselshell River, 3433 and 3436; 

 Running Wolf Creek, 3404: Judith Gap, 1882, R. W. Springer, 

 XXIII; Flathead Region, 1883, H. B. Ayres: Sheep Creek, 

 1883, Scribncr, 331; Madison Valle}', 1S71, Ilayden ; Fort Lo- 

 gan, 1882, Canby. 



Yellowstone Park r- Lake, 1885, Tzucedy, 3^0. 



Sporobolus depauperatus (Torr.) Scribner, Bull. Torr. Bot. Club, 

 9: 103 [Man. R. M. 411]; Mlfa depaupcrata Torr.; Hook. 

 FL Bor. Am. 2: 257 [Bot. Cal. 2: 267]. 



Closeh' allied to the preceding and by most botanists regarded as 

 only a depauperate form thereof, but a knowledge of the two in the 

 field has persuaded me that they are distinct. S. depauperatus has 

 shorter spikelets and grows in very dense tufts : most of the branches 



