232 



com;parative a^^altsis. 



Spikolcts with one perfect floret . . JJniJlora. 



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



Leaves much longer than the pale panicle . Bepauperata. 



(31. cajrulea B. Hooker.) 



HoLctrs. 

 Awn longer than the calyx, joints of culm downy 

 Awn not longer than the calyx, joints not downy 



AEEnENAXnEEUJI. 



Mollis. 

 Lanatus. 



Spikelets greenish brown 

 Florets awnless 

 Spike bluish, ovate 



Spikes alternate 



Setaeia. 

 Bristles of involucre, with reflexcd teeth 

 Bristles of involucre, with erect teeth 



HlEEOCHLCE. 



Sesleeia. 



PaIv'ICCM. 



Avenaceum. 



. Borealis. 



. Cccrulea. 



Crus-galli. 



Verticillata. 

 Viridis. 



Glyceeia, (Poa, Hooler.) 



1. rioi'ets with seven or more ribs. . . 2 

 Florets with not more than five ribs . . .3 



2. Panicle much branched, plant four feet high . Aquatica. 

 Panicle slightly branched, plant not more than three feet 



high ..... Fluitans. 



3. Panicle compact, rigid ... 4 

 Panicle spreading, not rigid . . .6 



4. Boot creeping .... Maritima. 

 Boot fibrous . . . . .5 



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

 Florets six or seven, nearly ribless, plant erect, or ascending Rigida. 



6. Panicle reflexed in fruit . . . Distans. 

 Panicle not reflexed in fruit . . . Borreri. 



PoA. 



1. Florets webbed .... 2 



Florets not webbed . . . .7 



2. Stem bulbous at base . . . Bulhosa. 

 Stems not bulbous at base . . . .3 



3. Culm much compressed, spikelets five or more flowered Compressa. 

 Culm round, or but little compressed, spikelets three or 



four- flowered .... 4 



