416 MONOCOTYLEDONOUS PLANTS. 



pid, in pairs ; glumes linear, nerved, awned, nearly as long as the 



spikelets ; leaves and sheaths smooth. 



HAB. Shady woods. Penn. and Virg. Pursh $ Schweinitz. 

 June. L(. Culm erect, 8 inches high, striate. Leaves lanceo- 

 late, acuminate, scabrous above. Spike erect, somewhat spread- 

 ing, with the rachis pubescent. 



50. TRITICUM. Linn. 



Spikelets sessile on the teetli of the rachis, many-flowered. 

 Glumes 2-valved ; valves nearly equal, beardless or with one 

 beard enclosing the florets. Palea 2, one of them bearded 

 from the end. Seed enclosed in the paleae. Flowers spiked. 



Triandria. JDigynia. 



1. T. crstirum Linn. : spike parallel, compressed ; glumes 4-flower 

 ed, ventricose ; bristles generally much longer than the florets. 



HAB. Fields naturalized. June. . Culm 3 4 feet high. 

 Spike 3 6 inches long, with the rachis jointed. Wheat. 



2. T. rcpcns Linn. : spikelets oblong, 5-flowered ; glumes subulate, 

 many-nerved ; florets acuminate; leaves flat ; root creeping. Agro- 

 pyron repens P. de B. Torr. 



HAB. Fields. N. S. W. to. Miss. July. U.Root white, 

 jointed, proliferous. Culm 2 feet high. Spike 3 4 inches long. 

 A troublesome weed. Couch Grass. Quack. 



3. T. caninum Linn. : spikelets about 5-flowered, compressed ; 

 glumes 3-nerved, and as well as the florets armed with a bristle at the 

 tip ; root fibrous. 9gropyron caninum R. 4 fif. Torr. 



HAB. Del. Muhl. If. Culm 2 3 feet high. . Leaves flat, 

 smooth. Spikelets sometimes 6-flowered. 



4. T. cristatum Schreb. : spike oblong, compressed ; spikelets op- 

 posite, compressed, distichously imbricated ; about 5-flowered, smooth- 

 ish, spreading ; florets subulatc-awned \ culm erect, smooth. Bromus 

 cristatus Linn. 



HAB. Penn. Schtceinilz. 



51. LOLIUM. Linn. 



Spikelets sessile, to the lowest a glume of 1-valve, to the up- 

 permost of 2 opposite valves. Lower palea with a mucro or 

 bristle at the end ; upper membranous, bifid-toothed. Scales 

 with 2 unequal teeth. Seed furrowed. Spike compound. 



Triandria. Digynia. 



1. L. perenne Linn. : floret much longer than the glume, unarmed, 

 linear- oblong, compressed ; root perennial. 



HAB. Meadows, &c. N. S. May, June. 2^. Root creeping. 

 Culm 18 inches high, smooth. Spike 6 inches long, with the 

 spikelets 7 9-flowered. Darnel. 



