MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 35 



* Calamagrostis Canadensis acuminata Vasey, Bull. U. S. Dept. 



Agric. Div. Agrost. 5 : 26 [Kearne}^ Bull. 11 : 29]. 



Spikelets 3.5-4 mm. long; empty glumes sharply acuminate. It 

 approaches C. Langsdorfi^ from which it differs in the smaller 

 spikelets and shorter awns. It grows in similar situations as the 

 species and is fully as common, and reaches an altitude of 2500 m. 



Montana: Manhattan, 1895, Shear, //p and ^2^; Rydberg, 

 2iSg; Spanish Basin, 1896, Flodman, jp; Elk Mts., near Castle, 

 5^; Deep Creek, 1883, Scrihncr, jj8 ; Beaver Creek, 226; Lima, 

 1895, Shear, jjj ; East Gallatin Swamps, 1896, Rydderg; J202; 

 Castle, J2Jj; Yogo Gulch, 3408; Bridger Caiion, 3205; Spanish 

 Creek, 3016, 3024, 304^, 3073^ Little Belt Mts., 3338, 3333; 

 Spanish Basin, 1896, T. A. Williams, 2027 and 2037^,; Silver Bow 

 Co., Mrs. Ida Christie. 



Yellowstone Park: Pelican Creek, 1885, Tzueedv, 384; Upper 

 Falls, 187 1, Hayden, jj ; 1885, Letlerman, 46: Mammoth Hot 

 Springs, 1893, Burg-lchaus. 



* Calamagrostis Macouniana Vasey, Contr. U. S. Nat. Herb. 3: 81 



[Kearney, Bull. U. S. Dept. Agric. Div. Agrost. 11 : 31 ; 111. 



Fl. i: 163]; Deyeiixia ]\facoicniana Wd.s&y, Bot. Gaz. 10: 297. 



Differs from C. Canadensis in the stricter habit, smaller, denser 

 and more contracted panicle and smaller spikelets. On river banks 

 at an altitude of 1500 m. 



Montana: Manhattan, 1895, Shear, 422: Rydberg; 2ic)i)4- 



* Calamagrostis Scribneri Beal, Grasses N. Am. 2 : 343 [Kearne}', 



Bull. U. S. Dept. Agric. Div. Agrost. 11 : 31] ; Calamag'rostis 



dubia Scribn. ; Vasey, Cont. U. S. Nat. Herb. 3: 80: Devctixia 



diibia Scribn., Bot. Gaz. 11 : 70. 



Differs from C. Canadensis in the stricter habit, the contracted 

 narrow panicle, the longer and stouter awn, and the glaucous upper 

 surface of the leaves. It grows in wet meadows, among bushes, on 

 river banks, etc., to an altitude of 2500 m. 



Montana; Spanish Basin, 1896, Flodman, 47: Alhambra, 1888, 

 Kelsey ; Belt Mountains, 1886, R. S. Williams: Fort Logan, 1883, 

 Scribner, 363 ; 1887, Knowlton ; Spanish Basin, i8g6, Rydberg, 

 ,3083, 3og6 and j/oo; T. A. Williams, 2oog and 2037; East Galla- 

 tin Swamps, 1896, Rydberg, 3204. 



Yellowstone Park: Slough Creek, 1885, Tzceedy, 383 (type). 



