266 PRACTICAL COURSE IN BOTANY 



whether of one or more carpels, as the peach, cherry, bean, 

 and lemon. 



302. Accessory fruits are so called, because some other 

 part than the seed vessel, or ovary proper, is coherent with, 

 or accessory to it, in forming the fruit, as in the apple and 

 the hip. The accessory part may consist of any organ, but 

 is more frequently the calyx or the receptacle. In the straw- 

 berry, the little hard bodies, usually called seeds, that dot 

 the surface are the true fruits (akenes). A vertical section 

 through the center will show the edible part to consist 



400 401 



FiQS. 400, 401. — Vertical sections showing the relation between a strawberry 

 flower and fruit: 400, the flower; 401, the fruit developed from it. The corre- 

 sponding parts are indicated by connecting lines ; r, receptacle ; a, sepal ; b, petal ; 

 8, stamens ; c, carpel (akene in fruit) ; p, style of the pistil ; pi, pulp of the fruit. 



wholly of the enlarged receptacle. In the pineapple, the 

 edibla stalk may be traced through a mass of flowers 

 whose seed vessels have become enlarged and ripened into 

 fruits. 



303. Aggregate fruits. — Some accessory fruits, the straw- 

 berry and blackberry for example, are, at the same time, 

 aggregate ; that is, they are composed of a number of sepa- 

 rate individual fruits produced from a single flower. The 

 cone of the magnolia and of the tulip tree are aggregate 

 fruits; can you name any others? 



