66 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



*Agropyron riparium Scribn. & Smith, Bull. U. S. Dept. Agric. 



Div. Agrost. 4 : 35. 1897. 



Glaucous, with narrow involute leaves and empt}^ glumes that are 

 less then one-half the length of the spikelet. River banks, rare. 



Montana: Deer Lodge, Shear, 372', Garrison, 36^: Rxdhcrg, 

 212^ (type) ; East Gallatin Swamps, 1896, Flodinan, 211 (?). 



*Hordeum aegiceras (E. Mey.) Royle ; Walp. Ann, 3: 787 ; Cn'fho 

 acgiceras E. Mey. Hort. Reg. Sem. 1848: 5. 

 The pearl barle}" is sometimes found escaped from cultivation. 

 Montana : Wolf Creek, July 27, 1897, Rydberg <£- Bcssey, 3720. 



Hordeum jubatum L. Sp. PI. 85 [Man. R. M. 427 : 111. Fl. i : 229; 



Bot. Cal. 2 : 324]. 



Common on prairies to an altitude of 2000 m. A troublesome 

 weed. 



Montana: Deer Lodge, 1895, Shear, 373: Rydberg, 21 ly; 

 Great Falls, 1886, R. S. IVH/iams, 577,' Custer Co., Mrs. Light; 

 Madison Co., Mrs. i\fc3ViiIty ; Bozeman, 1887, Tzveedy : East Galla- 

 tin Swamps, 1896, Rydberg, J 18^; Jefferson City, 1883, Seribner^ 

 431 ; Gallatin City, 42S. 



Hordeum nodosum L. Sp. PI. Ed. 2, 126 [>Lin. R. ^l. 427 ; 111. Fl. 



I : 228 ; Bot. Cal. 2 : 324] ; Hordeum -pratense Huds. Fl. Angl. 



Ed. 2, 56. 1762. 



Common in meadows up to an altitude of 2500 m. 



Montana: Dillon, \%()-^, Shear, j^6 ; Rydberg, 2082 ; Melrose, 

 2ogg; Mystic Lake, Shear, 488; Lima, 36^; Great Falls, 1891, 

 R. S. Williams, ^84; Big Hole Valley, Watson, 18S0: Cliff Lake, 

 July 27, 1897, Rydberg ct- Bessey, 3718; Spanish Basin, 1896, Ryd- 

 berg, 3045, j/2j,j7dj; Jefferson City, 1883, Scribner, 433. 



Yellowstone Park : 1884, Tzveedy, 247 : East De Lacy's Creek, 

 Aug. 10, 1897, Rydberg (t- Bessey, 3^1 g. 



* Hordeum Montanense Scribner; Beal, Grasses N. Am. 2: 644; 



S. & S. Bull. U. S. Dept. Agric. Div. Agrost. 4: 25. 



Differs mainly from H. nodosum in being somewhat taller, having 

 longer awns and the florets of the central spikelet not sessile. 



Montana: Sand Coulee, 1883, Scribner, 430; Horned Creek, 

 4290- 

 Sitanion elymoides Rafin. Journ. Phys. 89: 103, 1819; Elymus 



Sitanion Schultes, Mant. 2: 426 [Man. R. M. 427: Bot. Cal. 2: 



