THE ORDER AND ITS TRIBES. 39 



after the fall of the paleae. Internodes between glumes 

 or florets distinct. 

 Glumes four. Florets one or three. PHALARIDE&. 

 Glumes two (rarely more). 



Spikelets with one floret. AGROSTIDE/E. 

 Spikelets with two or more florets. 

 Spikelets in panicles or racemes. 



Glumes generally longer than outer palea, usually 



with a bent dorsal awn. AVENEJE. 

 Glumes generally shorter than outer palea, 

 usually unawned or with a straight terminal 

 awn. FESTUCE&. 

 Spikelets in double rows, the spike one-sided. 



CHLORIDES. 

 Spikelets in opposite rows, spike two-sided. 

 HORDEAB. 



Looking down this arrangement we notice at once that five 

 of the tribes — Bambusae, Maydeae, Andropogoneae, Zoysieae, and 

 Tristegineae — are not British and need not concern us ; and that 

 by viewing the table from a purely British point of view we can 

 simplify matters much further. And so we can ; the following 

 being the key with which we have worked through our native 

 genera : 



Glumes 4. PHALARIDE/E. 

 Glumes 3. PAN ICE JE 

 Glumes o. ORYZE/E. 

 Glumes 2. 



Florets one. AGROSTIDEM. 

 Florets more than one 

 Spikes. 



Spikelets in two rows on one side. CHLORIDEAE, 

 Spikelets in two opposite rows in notches. HORDE&, 

 Spikelets in two opposite rows turning to one side. 

 FESTUCE& (as regards Poa loliacea). 



