20 FIRST BOOK OF GRASSES 



These basic facts kept in mind will aid in the recogni- 

 tion of compHcated or congested spikelets and in the 

 correct interpretation of their parts. 



REVIEW 



(1) Examine a spikelet of a brome-grass, such as cheat or 

 chess. Separate the florets from each other and from the glumes. 

 Note that these disjoint without tearing. Open out the lemma 

 and palea. Note that these permanently adhere at their base; 

 that they can only be torn or cut apart. 



(2) Name the parts of a spikelet. 



(3) What is their arrangement? 



(4) What is the difference between a rachis and a rachilla? 



