226 University of California Publications in Agricultural Sciences [Vol. 7 



From the data presented in table 3, it is fair to conclude that 

 there is segregation with respect to mean lobe number in Fo. Both 

 the Fi and F, are intermediate between the two grandparent types 

 and in the latter there is no transgressive segregation on the side of 

 the higher number of lobes. The number of lobes ranges from 6 to 13 

 in the F2 family 21.141 and arranging the plants in class groups their 

 distribution is as follows, the mean being at 9. 



256 



This tabulation shows that the inheritance of lobe number is compli- 

 cated ; and, while more of the plants show the lobe number of the lower 

 numbered parent, the majority of them are intermediate as required 

 by the hypothesis of multiple factors. The same remarks apply to the 

 other F2 populations studied, and there must be at least four factors 

 responsible for number of lobes in the leaves. 



The length of the leaf has little or no influence upon the number of 

 lobes in the leaves. The accompanying correlation chart, table 4, 



TABLE 4 



Correlation Table for Number of Lobes (x) and Length of Leaf in cm. (y) 



Family 21.140 



r,,„ = 0.2302 ± 0.0388 



