BRANCHES AND LEAF-NUMBER. 



109 



THE RELATION OF THE PRESENCE OF BRANCHES TO THE NUMBER 

 OF LEAVES IN THE WHORL. 



The lateral branches in Ceratophyllum always originate of course at 

 nodes, and hence in each case a branch comes into very close relation 

 with the whorl at that node. It seemed desirable to determine whether 

 the presence of a branch at a node in any way influenced the number of 

 leaves in the whorl belonging to that node. To this end frequency 

 distributions were formed for each plant and series, giving the leaf- 

 number in every whorl at which a branch originated. These distribu- 

 tions are given in table 54. 



Table 54. — Frequency distributions for leaf-number in whorls at which branches 



originate. 



