138 



BOTANY. 



What is known as compound inflorescence occurs when 

 the flower-clusters of a plant develop in one way, and the 

 plant itself develops in another way. This state of things 

 is often met with. Compare the 

 development of the sunflower 

 with that of catnip and hoar- 

 hound in this respect. 



FIG. 



FIG. 415. 



The indefinite mode of growth is sometimes spoken of 

 as centripetal, because the flowers open first at the circum- 

 ference ; while definite forms are said to be centrifugal, 

 because here the flowers open at the center first. 



