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 
“flowers’’ are compact clus- 
ters or heads of numerous 
small flowers (Figs. 298 and 
299). 
i 
i 
j 
§ 
Fic. 223.—Umbel of cherry.— Fic. 224.—Umbel of hemlock.— 
After DucHartre. After SCHIMPER. 
