Xo. 629] FLOWER MM III: I: l.\ \ K h'XOXIA 529 



a general variation between different individuals, pos- 

 sibly correlated with the size and vigor of the plant and 

 therefore indirectly with the habitat. 



1. Within a single cyme of 2-6 heads, the terminal 

 head is usually the largest. In larger cymes of 7-9 heads 

 some of the secondary terminal heads, ending the lower 

 lateral branches of the leafless cluster, are frequently 

 larger than the primary terminal head. 



Table I exhibits the number of flowers in the terminal 



mid these have been 

 of the 25, the prim 

 average of the othc 



