THE ORDER AND ITS TRIBES. 41 



so that they remain after the fall of the palea?. Glumes four, 

 unequal, third and fourth occasionally very small or one of 

 them rudimentary. Paleae laterally compressed, nerves one or 

 none, awnless. Spikelets upon pedicels in panicles, spike-like 

 panicles or racemes without notches on the main axis. Stigmas 

 usually projecting from the point of the spikelet. Seed un- 

 furrowed, embryo small. Starch grains compound. 



Represented in Britain by four genera, Phalafis tt, Digraphis 

 12, Anthoxanthum 10, Hierochloe 9. 



Agrostidh/e. Spikelets with one floret ; rachilla sometimes 

 produced beyond the palea and generally articulated above the 

 glumes, so that they remain after the fall of the paleae. Glumes 

 two (very exceptionally none), often unequal, usually at least as 

 long as the outer palea. Palea with two nerves. Spikelets upon 

 pedicels in panicles, spike-like panicles or racemes, without 

 notches on the main axis. Seed unf arrowed, embryo small ; 

 starch grains compound. 



Represented in Britain by ten genera, Milium 2, Phleum 

 13-17, Alopecuvus 18-21, Mibora 22, Polypogon 24, 25, Agrostis 

 26-29, Gasividium 30, Calamagrostis 32-35, Psamma 31, 

 Lagurus 23. 



Aveneje. Spikelets with two or more florets (exceptionally 

 with one) ; rachilla frequently produced beyond the florets and 

 generally articulated above the glumes, which often remain after 

 the fall of the paleae. Distinct internodes between the florets. 

 Spikelets in panicles, rarely in spikes. Florets all perfect or 

 one of them male. Outer palea generally shorter than glumes 

 and awned on the back ; awn bent, rarely nearly straight ; 

 inner palea with two keels. Style short or absent ; stigmas 

 feathery, protruding above the base or middle of the spikelet. 

 Seed usually furrowed ; embryo small ; starch grains compound. 

 Represented in Britain by four genera, Holciis 45, 46, Air a 

 36-40, Avena 41-43, Arrhenatherum 10. 



Festuce^e. Spikelets with two or more florets (rarely with 

 one), usually perfect ; rachilla frequently produced beyond the 



