ANTHOTAXY 105 



X. In reviewing the work on flower clusters, be careful to 

 consider the following points : 



1. The exact difference between the determinate and inde- 



terminate anthotaxy. 



2. What characters have-the following indeterminate clusters 



in common : raceme, corymb, and umbel? 



3. How may they be distinguished from one another? 



4. What characters have the following indeterminate clusters 



in common : spike, spadix, and head? 



5. How may they be distinguished from one another? 



6. How may the group of clusters mentioned in 2 be dis- 



tinguished from those mentioned in 4? 



7. Write out concise (i.e. using no unnecessary words) defi- 



nitions of all the flower clusters you have studied. 



XL Many flowers are not in clusters at all, but occur 

 singly. They may be : 



1 . Terminal in some cases, as in the Rose, but mostly 



2. Axillary, at least if considered very carefully. 



