GROSS ANATOMY OF TEE ANOIOSPEBMS. 317 



1. One stone, usually one-celled — e.g., Cherry Dbupb. 



2. Stones or papery carpels, two or more — 



e.g., Apple Pome. 



Fio. 218.— Achenial Fruits: 1, nut of Oak, also shown in section; 2, 

 achene of Buckwheat ; 3, double samara of Maple. 



VI. Aggregate Fruits — Polycarpellary ; carpels always distinct. 



The forms of these are not well distinguished. In many Banun- 

 culaceae there are numerous achenes on a prolonged 

 receptacle ; in Magnolia numerous follicles are simi- 

 larly arranged ; in the raspberry many drupelets 

 cohere slightly into a loose mass, which separates at 

 maturity from the dry receptacle ; in the blackberry 

 similar drupelets remain closely attached to the 

 fleshy receptacle ; in the strawberry there are many 

 small achenes on the surface of the fleshy receptacle ; 

 finally, in the rose several to many achenes are enclosed within the 

 hollow and somewhat fleshy receptacle. 



Fig. 219. 

 Berry of Grape 



