286 RELATION OF PHYLLOTAXIS TO MECHANICAL LAWS. 



floral types of varying degrees of eccentricity, while other com- 

 plications occur, owing to the fact that eccentricity may not 



Fig. 99.— Eooentrie growth-system (5 + 8), orientated for plane of No. 2. Growth- 

 centre anterior ; a portion of the construction -network indicated on one aide. 



always follow the same plane of sepal 2. Every flower requires 

 to be considered on its own merits, according to the time at 

 which eccentric growth commences and the degree of eccentricity 



