69 



Poa trivialis var. occidentalis : 



This grass, apparently fi variety of Poa trivialis, appears to be indige- 

 nous in Colorado and New Mexico. It has a larger, looser panicle 

 than the introduced plant. 



Poa andiua. 



This is a smooth, rigid, perennial grass, growing on the great west- 

 ern plains in arid situations. It varies in height from 1 to 2 feet, with 

 short, rigid, pointed root-leaves, and with usually one or two stem- 

 leaves, the upper one with a very short blade, or almost none. The 

 panicle is close and rather dense, 2 to 3 inches long, the spikelets about 

 three flowered, the empty glumes rather large and broad, and the 

 flowering glumes pubescent on the nerves below. 



It is probable that this species may be introduced with advantage 

 into cultivation in the arid districts of the West. (Plate 78.) 



GLYCERIA. 



Spikelets terete or flattish, several to many flowered, in a narrow or diffuse panicle, 

 the rhachis smooth, and readily disarticulating hetween the flowers ; outer glumes 

 shorter than the flowers, unequal, membrauaceous, one to three-nerved, unawnrd; 

 flowering glume membranaceous to subcoriaceous, obtuse, awnless, more or less hya- 

 line and denticulate at the apex, rounded (never keeled) on the back, five to nine- 

 nerved, the nerves separate, and all vanishing be fore reaching the apex; palet about 

 as long as its glume, two-keeled, entire or bifid at the apex. 



The species of this genus are seldom employed in cultivation. They 

 mostly grow in wet or swampy ground, and where found in abundance 

 can be utilized for pasturage or hay-making. 



Glyceria arundinacea (Tall Meadow Grass ; Reed Meadow Grass). 



This species is widely diffused in the northern portions of the United 

 States and Canada, and in the Rocky Mountains from Mexico to Mon- 

 tana. It has a stout, erect, leafy culm, 3 to 4 feet high. The leaves 

 are a foot or two long, a quarter to half an inch wide, flat, and some- 

 what rough on the edges. The panicle is large, 9 to 15 inches long, and 

 much branched. (Plate 79.) 



Glyceria Canadensis (Rattlesnake Grass ; Tall Quaking Grass). 



The culms stout, about 3 feet high, smooth and leafy. The leaves linear-lanceo- 

 late, 6 to 9 inches long, or the lower ones much longer, about 4 lines broad and rather 

 rigid. The panicle large and effuse, 6 to 9 inches long, oblong, pyramidal, and at 

 length drooping. The ^vhorls an inch or more distant, the branches semi-verticillate, 

 mostly in threes, the largest 3 to 4 inches long, and subdivided from near the base. 



A grass belonging to the northern portion of the United States, usu- 

 ally found in mountainous districts, in swamps, and on river borders, 

 growing in clumps. It is quite an ornamental grass, resembling the 

 quaking grass (Brtea). Cattle are fond of it, both green and when 

 made into hay. It is well adapted to low meadows. 



