232 



COMPABATIVE ANALYSIS. 



Spikelets with one perfect floret . . Uniflora. 



3. Leaves much shorter than the purplish panicle . Cmrulea. 



Leaves much longer than the pale panicle . Depauperata. 



(M. cserulea /3- Hooker. 

 Holcxts. 



Awn longer than the calyx, joints of culm downy . . Mollis. 



Awn not longer than the calyx, joints not downy . Lanatus. 





AEEHENATHEErfM. 



Spikelets greenish brown 







HlEE0Cm,O3. 



Florets awnless 



• 





Sesleeia. 



Spike bluish, ovate 







Panicum. 



Spikes alternate 



. 



Seiaeia. 

 Bristles of involucre, with reflexed teeth 

 Bristles of involucre, with erect teeth 



Gltceeia, (Poa, Hooker.) 



1. Florets with seven or more ribs 

 Florets with not more than five ribs 



2. Panicle much branched, plant four feet high 

 Panicle slightly branched, plant not more than 



high 



3. Panicle compact, rigid 

 Panicle spreading, not rigid 



4. Boot creeping 

 Boot fibrous 



5. Florets four or five, five-ribbed, plant procumbent 



Cmrulea. 

 Crus-galli. 



Vertieillata. 

 Viriiis. 



2 

 3 



Aquatiea. 

 three feet 



. Fluitans. 



4 



6 



Maritima. 



5 



Procumlens. 



Florets six or seven, nearly ribless, plant erect, or ascending Rigi&a. 

 Panicle reflexed in fruit . . . Distans. 



Panicle not reflexed in fruit . . . Borreri. 



Poa. 



Florets webbed .... 2 



Florets not webbed . . . .7 



Stem bulbous at base . . . Bullosa. 



Stems not bulbous at base . . . .3 

 Culm much compressed, spikelets five or more flowered Compressa. 



Culm round, or but little compressed, spikelets three or 



four-flowered .... 4 



