272 CONTROL OF REPRODUCTION 



nance. It would seem that a very different distribution of energy 

 expenditure is called for. Each flower, single or collective, is on an 

 axis in which no elongation takes place, resulting in a short shoot. 

 Moreover, the leaves of the flower — the floral parts — have an entirely 

 different order of development from vegetative leaves. Auxin and other 

 growth-controlling substances must be greatly changed quantitatively, 

 if not qualitatively, under floral induction, for the characteristics of 

 growth expression are startlingly different both in pattern and in 

 extent. 



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