GRASSES OF BRITAIN'. XXI 



1 Ith. POACE^. — Inflorescence panicled or racemed. Spikelets of 

 two to eighteen florets. Florets mostly membranous at the summit, 

 occasionally pointed, but not awned. Eight genera, Poa, Hierochloa, 

 Triodia, Briza, Jlelica, Cafabrosa, Molinia, Airochloa, 



\2tlu AYENACE^. — Inflorescence panicled or racemed. Spike- 

 lets of two to four florets. Florets awned from the base or centre ; 

 (occasionally the lowermost floret is awnless, in that case the second 

 floret is awned a little beneath the summit) Five genera, Avena, 

 Trisetum, Arrhenatherum, Holcus, Aira. 



\Zth. FESTUCACE^. — Inflorescence panicled or racemed. 

 Spikelets of two to fourteen florets. Florets awned from the summit 

 or a little beneath it : ( when the awn is wanting, the spikelets have 

 more than six florets. Glumes very unequal, and the ligule short 

 ^ and truncated.) Five genera, Festuca, Bucetum, Bromus, Dacti/lis, 

 Cynosurus. 



I4th. HORDE ACE^. — Inflorescence spiked or shortly racemed. 

 Spikelets arranged on both sides of the rachis, composed of one to 

 eighteen florets. Florets awned from the summit or a little beneath 

 it, occasionally the awn is wanting. Four genera, Hordeum, Ely- 

 mus, Triticum, Lolium. 



loth. NAEDOIDE^. — Inflorescence spiked. Spikelets of one 

 floret, rarely two, enclosed within the glumes. Sometimes the glumes 

 are entirely wanting. Two genera, Nardus, Rotthollia, 



