234: 



A TEXT-BOOK OF BOTANY 



top of the main axis, the cluster is called a head, the most 

 notable illustrations being such plants as the sunflower or 



dandelion, whose so-called 



r^-^ " flowers " are compact clus- 

 j ters or heads of numerous 



small flowers (Figs. 298 and 

 299). 



FIG. 223. Umbel of cherry. 

 After DUCHARTRE. 



FIG. 224. Umbel of hemlock. 

 After SCHIMPER. 



