74 



The Living Plant 



Leaf-blades 



Petioles 



Flower parts 



Foliage 



Insect traps 



Bud covers 



Stipules 



Stems 



Roots 



Storage 



Absorption 



Fio. 25. Diagram to illustrate the interrelations of morphological origins with ecological 

 uses in the parts of the higher plants. 



climate, in which case the function of foliage is taken over by 

 some other part, usually the stem. Now it is conceivable that 

 when, by another change of habit, the plant finds itself in need 

 of a much larger spread of chlorophyll surface, this may be more 

 easily obtained by further enlarging and flattening the already 



