SPECIES AND VARIETIES. 



341 



gated and abruptly bent down^ the spikelets distant, and the 

 glumes enlarged, awl-shaped. — Salt marshes, rare. 



(324) Hordeum. Barley. 



H. pratense : stems erect or decumbent, two feet high ; 

 leaves glabrous and rather narrow; spike H-2 inches long, 

 close, cylindrical ; flowers of the central spikelet only perfect, 

 the outer glumes of all the spikelets awn-like from the base. — 

 Moist meadows and pastures. Fl. June. 



H. murinum : annual ; stems decumbent at the base, 1-2 

 feet long ; leaves often hairy ; spike dense, cylindrical, 3-4 

 inches long, thickly beset with the long rough awns; outer 

 glumes of the three spikelets all awn-like, but those of the 

 central spikelet somewhat broader at the base and ciliate. — 

 Mouse Barley. — Waste places, roadsides, etc. Fl. June to 

 August. 



(325) Triticum. Wheat-grass. 



T. repens : stems stiff, ascending or erect, 1-3 feet high, 

 sometimes glaucous ; spikelets placed on alternate sides of a 

 spike, 2-6 inches long; glumes 5-7 ribbed, acute, or termina- 

 ting in an awn. — Couch-grass. — Fields and waste places. Fl. 

 July. 



T. junceum, a plant with glaucous herbage and very blunt 

 glumes to the spikelets, is common on sandy sea- shores. 



T. caninum also closely resembles T. repens , but the stems 

 are tufted, more leafy, and less glaucous ; the glumes rather 

 thinner, with five prominent ribs, and terminating in a rather 

 long awn. — Woods and banks. Fl. July. 



(326) Lolium. Rye-grass. 

 L. perenne : stems erect or slightly decumbent, 1-1^ foot 



