GRAMINE^I. 41$ 



H. jubatum Linn. : lateral florets abortive, neuter ; bristles of the 

 glume and palese 6 times as long as the flowers. 



HAB. Marshes near Boston. Big. N. to Subarc. Amer. June. 

 $. Culm 2 feet high, simple, slender. Spikes 2 inches long. 



Squirrel-tail Grass.. 



48. SECALE. Linn. 



Spikelets in each tooth of the rachis solitary, 2 3-flower- 

 ed ; the 2 lower florets fertile, sessile,- opposite ; the upper 

 abortive. Glumes subulate, opposite, entire, shorter than the 

 florets. Lower palea entire, with a very long bristle ; upper 

 bifid-toothed. Scales obovate, hairy. Seed coated, furrowed 1 . 

 Triandria. Digynia. 



S. cereale Linn. : glumes and bristles scabrous- ciliate ; paleae smooth. 



HAB. Old fields. June. or $ .Culm 3-4 feet high. Spike 



4 6 inches long. Lower palea terminating in a long scabrous 



bristle. Rye,. 



49. ELYMUS. Linn. 



Spikelets 2 or more at each joint of the rachis, 3 9-flowx 

 ered. Glume 2-valved, nearly equal, rarely (as in E. hys- 

 trix,} absent or nearly so. Lower palea entire, with a bristle 

 which is sometimes very short ; upper somewhat bifid-toothed. 

 Scales ovate, hairy. Seed furrowed. Spike simple. 



Triandria. Digynia. 



1. E. virginicus Linn. : spike erect, coarctate .; spikelets ia pairs, 

 2 3-flowered; florets smooth ; glumes lanceolate, nerved. 



HAB. River banks. N. J. to Car. W. to Mich. July, Aug. 

 24. Culm 3 4 feet high, smooth; Spilce thick and stiffly 

 erect. . Lime Grass. 



2. E. canadcnsis Linn. : spike nodding at the extremity, patulous y 

 spikelets 3 5-flowered ; florets hairy ; glumes linear-lanceolate. 



b. glaucifolius Torr. : leaves glaucous. E. glaudfolius Willd. 

 HAB. River banks. N. S.. N. to Subarc. Amer. Aug. Z/. . 



Root creeping. Culm 34 feet high. Spike 6 inches long, 



pendulous at the extremity. 



3. E. villosus Mulil. : spike a little nodding at the extremity, patu- 

 lous ; rachis and florets hispid-pilose ; spikelets geminate, 2 3-flow- 

 ered ; glumes linear, pilose-ciliate, 2-nerved, shorter than the florets. 



HAB. Hills. N. J. to Vir. July. 2J..Culm 23 feet high. 

 Spike 3 inches long, at length incurved at the extremity. 



4. E. hystriz Linn. : spike erect ; spikelets diverging ; glumes none. 

 HAB. Rocky hills. N. Y. to Car. July. U-Culm 3 feet 



high. Spike 6 inches long. Leaves often glaucous. 



5. E. striatus IVilld. : spike erect ; spikelets 2-flowered, awned, his- 



