MORPHOLOGY OF ANGIOSPERMS. 



151 



Classification of Fruits. — More or less •artificial classifica- 

 tions of fruits have been made. They may be grouped either 

 according to structure or according to their manner of protection 

 or dispersal, the following classification being based on the 

 structure : 



I Strobile or Cone 

 Sorosis 

 Syconium 



a. Indehiscent 



Prom a single 

 flower 



A. With a compound pistil 



Dry.. 



Fleshy 



Akene 



Caryopsis 



Cremocarp 



Nut 



Samara 



Utricle 



Berry 



Drupe 



Etsrio 



Hesperidium 



Pepo 



Pome 



b. Dehiscent 



■{Dry.. 



{Capsule 

 Follicle 



. B. With a simple pistil 



Indehiscent J Fleshy J Drupe 



.b. Dehiscent../ Dry... /^°"''=1^ 

 [ [ Legume 



VI. THE SEED. 



The seed may be defined as the fertilized and developed ovule. 

 The seeds of different fruits vary in number as well as in size 

 and shape. In form they correspond to the ovules ; in size they 

 vary from about r millimeter, as in the poppy, to 10 or 15 centi- 

 meters in diameter, as in the cocoanut palm. Seldom are all of 

 the ovules of the pistil fertihzed, hence the number' of seeds is 

 tisually less than the number of ovules. 



Structure of Seed. — After the fertilization of the egg-cell 

 certain changes take place in the embryo-sac: At one end the 

 developing embryo is attached to the wall by a short stalk or 

 suspensor (Fig. 57) ; the nuclei, lying in a mass of cytoplasm 



