144 



PRACTICAL COURSE IN BOTANY 



Fig. 173." — Scorpioid cyme. 



or coiled inflorescence of the pink-root {Spigelia), heliotrope, 

 comfrey, etc. Its structure will be made clear by an inspec- 

 tion of Figs. 174-176. 



Figs. 174-176. — Diagrams of cymosc inflorescence, with flowers numbered in the 

 order of their development : 174, cyme half developed (scorpioid) ; 175, a flat-topped 

 or corymbose cyme ; 176, development of a typical cyme. 



163. The nature of flower stems. — A comparison of 

 the types of inflorescence with the modes of branching in 

 ordinary stems (144, 152, 153) will show a strict corre- 

 spondence between them. Both bear leaves and buds, and 

 the individual flowers of a cluster usually spring from the 



