02 THE FIRST BOOK OF BOTANY. 



FIG. 167. FIG. 168. 



Corymb. 



Umbel. 



The CORYMB is a flower cluster, with a short 

 rachis, the lower pedicels of which are lengthened, so 

 that the cluster is flat at top. 



An UMBEL has no rachis, and the pedicels are of 

 nearly equal length. 



COMPOUND. 



FIG. 



FIG. 170. 



Compound Raceme. 



Compound Corymb. 



A COMPOUND RACEME, OR PANICLE, has a long 

 rachis, and the flowers grow upon branches of the 

 pedicels. When such a cluster is thick and cone- 

 shaped, it is called a Thryse. 



