182 SUMMER FLOWERS. 



(325) Triticum spike simple ; spikelets solitary, sessile, trans- 



verse to the rachis, many-flowered ; glumes two, opposite, 

 nearly equal, embracing the flowers ; pales two, lanceo- 

 late, the outer acuminate or awned, the inner bifid. 



(326) Lolium spike elongated, simple, compressed ; spikelets at 



right angles with the rachis, with a bract at the base of . 

 each ; glumes two, lateral, often deficient ; pales two, 

 nearly equal ; the outer sometimes awned under the apex ; 

 stamens three ; styles two. 



(327) Brachypodium spike simple ; spikelets transverse to the 



rachis, with a short pedicel ; glumes two, unequal, shorter 

 than the lower florets ; pales two, the lower awned under 

 the point, or awnless ; stamens three ; styles two. 



ttttt Spikelets several-flowered, pedicellate ; awns, if any, 



straight (Festuceae). 

 J Pales awned. 



(328) Bromus panicle loose ; spikelets laterally compressed ; 



glumes two, unequal, shorter than the lower florets ; 

 pales two, the lower awned under the apex, very seldom 

 awnless ; stamens three ; styles two. 



(329) Festuca panicle loose; spikelets laterally compressed; 



glumes two, unequal, or nearly equal, acute ; pales two, 

 the lower mucronate or awned at the point ; stamens 

 three ; styles two. 



(330) Dactylis panicle loose or somewhat contracted, the ter- 



minal ramifications always very short ; spikelets clustered, 

 horizontal ; glumes two, unequal-sided ; pales two, the 

 lower awned under the apex ; stamens three ; styles two. 



(331) Cynosurus panicle contracted, spike-like, unilateral ; 



spikelets two- or many-flowered, distichous, with a pec- 

 tinated involucre at the base ; glumes two, equal ; pales 

 two, the lower awned from the apex or mucronate ; 

 stamens three ; styles two. 



