AGGREGATE AND ACCESSORY FRUITS 149 



In the squash, pumpkin, and cucumber the ripened ovary, 

 together with the receptacle, makes up a peculiar fruit (with a 

 firm outer rind) known as the pepo. The relative bulk of the 

 greatly enlarged hollow receptacle and of the ovary in such 

 fruits is not always the same. 



The drupe. This fruit is often fleshy, and usually does not 

 split open. The pericarp, or wall of the ripened ovary (meaning 

 round about and fruit), consists of an outer fleshy (or fibrous 

 or leathery) layer, the exocarp, and an inner, somewhat hard or 

 stony layer, the endocarp. In common language the endocarp 

 with its contained seed is called a "stone"; hence drupes are 



B 



FIG. 165 

 A, strawberry; B, raspberry; C, mulberry. After Faguet 



often known as stone fruits. Most drupes, as in the case of the 

 peach (Fig. 164), cherry, plum, cocoanut, and walnut, are one- 

 stoned and one-seeded. 



184. Aggregate fruits. The raspberry (Fig. 165, B), blackberry, 

 and similar fruits consist of many carpels, each of which ripens 

 into a part of a compound mass which, for a time at least, clings 

 to the receptacle. The whole is called an aggregate fruit. 



185. Accessory fruits. Not infrequently, as in the strawberry 

 (Fig. 165, .4), the main bulk of the so-called "fruit" consists 

 rather of the receptacle than of the ripened ovary or its append- 

 ages. Such a combination is called an accessory fruit. 



186. Multiple fruits. The fruits of two or more flowers may 

 blend into a single mass, known as a multiple fruit. Perhaps 



