134 MIDDLESEX FLORA. 



H. maritimum, With. 

 Billerica, iu wool waste (Dr. C. "W. Swan). Adv. from Eu. 

 "Lateral flowers male or neutral; spikelets all awned; glumes 

 rough, the inner ones of the lateral spikelets half-lanceolate and 

 slightly winged, the remainder setaceous. Annual." Koch, 

 Taschenb. d. Deutsch. & Schw. Fl. 



JET. murinum, L. Way Bent. AVall Baklet. 



Lowell, Billerica and Dracut, in wool waste (Dr. C. W. SwanJ ; 

 N. Clielmsford, in wool waste (Rev. W. P. Alcott). Adv. froniEu. 

 " Annual, with stems 1 to 2 feet high, smooth leaves and inflated 

 sheaths : spike 2 to 3 in. long, inclined, compressed, usually included 

 at base by the upper slieath ; spikelets, including awus, 2 in. long : 

 glumes of the middle spikelet lanceolate, long-awned, and con- 

 spicuously ciliate on the margins ; outer glume of the lateral spike- 

 let setaceous, the other similar to those of tiie central one : lateral 

 florets longer than the central, attenuate into a long awn, scabrous 

 above, and the inner surface covered with long, weak hairs : palet 

 of perfect floret flattened, scabrous above, its awn about three 

 times as long and flattened below." Bot. Cal. 



Elymus, L. Lyme Glass. Wild Rye. 



E. Virginicus, L. 



Lowell, Melrose, Watertown, et al. Not uncommon. 



E. Canadensis, L. 

 Not uncommon. 



E. Canadensis, L., var. glaucifolius. Gray. 

 Merrimack River, Lowell (Dr. C W. Swan). 



E. striatus, Willd. 

 Lowell (Dr. C. W. Swan) ; Melrose (H. A. Young). Not com- 

 mon. 



AsrRELLA, Willd. 



A. Hystrix, Willd. (Gymnostichum Hystrix, Schreb., Man.) 

 Bottle-brush Grass. 

 Dunstable, Concord, Melrose, et al. Not very common. 



