32 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



This differs from A. exarata in the very large open panicle. It 

 occurs along streams at an altitude of about isoo m.. 

 Montana: Missouri Valle}-, 1883, Scn'huer, jjj. 



*Agrostis variabilis; Agi-ostis varians Trin. Mem. x\cad. St. Petersb. 



(VI,) 6: 314. 1845; not Tuill. 1790 [Vasey, Cont. U. S. Nat. 



Herb. 3 : 73 ; J^ot. Cal. 2: 273]. 



A small species 3-8 cm. high, with the palet very small or wanting, a 

 small narrow panicle and subequal empty glumes. It is a rare plant, 

 growing in wet meadows at an altitude of 2700 m. 



Yellowstone Park : Mirror Lake, 1885, Tzcccdv, 60 j : East De 

 Lacy's Creek, Aug. 10, 1S97, Rvdhcrg d- Bcsscv, jjjo. 



*Agrostis tenuiculmis recta Nash : Agrosfis font is c recta Vasey, 



MMS. : not A. crccta wSpreng. 



Agrostis tenuis "V^asey, Bull. Torr. Bot. Club, 10 : 21, is antedated 

 by A. tenuis Sibt. 1794, consequently both the specific and the vari- 

 etal name must be changed. It is a small plant with a small panicle 

 and erect or ascending rays, and no palet. In wet places at an alti- 

 tude of 2000-3000 m. 



Montana: Little Belt Mountains, 1896, Flodman, 2^; Rvdberg^ 



3327%' 



Yellowstone Park : East De Lacy's Creek, 1897, JRvdberg & 

 Bessey, jjyi ; East Fork, 1885," Tzceedv, 606. 



Agrostis hyemalis (Walt.) B.S.P. Prel. Cat. N. Y. 68 [111. Fl. 

 I : 161] : Cornucopiae //yen/a/is Walt. Fl. Car. 73 : ^Igrostis 

 scahra Willd. Sp. PI. i: 370 [Man. R. M. 412: Bot. Cal. 2: 



275]- 



A common grass growing in sandy soil to an altitude of 2000 m. 



Montana: Gallatin, 1895, Rxdl)erg, 22SS: ]Manhatten, Shear, 

 407 and 42J ; Rydberg, 2iyj; Helena, 2142; Sweet Grass Canon, 

 1896, Rlodnian, jo; Spanish Basin, Rydberg-, J044, 3^05i 3076, 

 301 J ; Grasshopper Caiion, 1880; Watson, 1883, Scribner, 353; 

 Cedar Mountain, 1897, Rydberg ci- Bcssey, 33/8. 



Yellowstone Park: 1873, C. C. Parry, 2^2; 1884, Tzueedy, 

 238, 606, 607, 608; 1871, Hayden; Lower Geyser Basin, 1897, 

 Rydberg ci- Bessey, 3374: Lower Geyser Basin, 3377. 



On river banks at low altitudes, there occurs a form with verv large 

 panicle and broad flat leaves. It is very unlike the typical A. hye- 

 malis in habit, but no essential differences in the flowers, etc., can 



