MONOCOTYLEDOITOUS OR ENDOGENOUS PLANTS. 609 



spikelets lanceolate after flowering, 10-12-flowered ; loiuer 

 glume 1-nerved, the upper 3-nerved ; loioer paleaconwQyiOVL 

 the back, 7-nerved, hairy, about as long as the awn ; culms 

 2°— i° high ; leaves and sheaths smooth or downy. Kiver- 

 banks and rich soil. June. 



B. SECALiNUS, L. {Cheat or Chess.) Annual; panicle 

 spreading, with clustered, at length drooping branches; 

 spikelets (i'-l' long) 8-10-flowered, oblong-ovate; loiver 

 gluiiie 5-nerved, the upper 7-nerved ; palece smooth, the 

 lower one convex, 7-nerved, awnless or short-awned; 

 culms l°-2° high ; leaves and sheaths smooth or downy. 



UNIOLA, L. 



Tough perennial grasses, loith erect culms, from creeping 

 rootstocks, and mostly broad, flat, many-floivered spikelets, 

 in erect or drooping panicles, with one or more of the loiuer 

 flowers glume-like and neutral, and the tipper imperfect; 

 glumes lanceolate, compressed-keeled ; loioer palea rather 

 rigid, strongly compressed-keeled, nerved, awnless, much 

 larger than the 2-keeled upper one ; gi'ai?i free ; stamens 

 -o. 



* Spikelets long-pediceled, drooping ; flowers appressed. 



U. LATIFOLIA, Michx. Culms 2°-3° high ; leaves flat, 

 lanceolate (i'-V wide) ; panicle loose, drooping ; spikelets 

 green, oblong, acute, 10-15-flowered ; loiver palea one-third 

 longer than the upper, fringed on the keel, acutish ; sta- 

 men 1. Banks of rivers. July and August. Spikelets 

 12"-15" long. 



ELYMUS, L. Lyme Grass. 



Coarse flat-leaved perennial grasses, ivith rigid erect culms, 

 hearing a single spike of 2-7 flotveird spikelets, arranged 2-4 

 in a cluster at each joint of the zigzag rachis ; glumes 2, 

 placed side by side before the spikelets, coriaceous, un- 



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