362 



BOTANY OF CROP PLANTS 



withered stamens are at the base of the fruit. These con- 

 stitute the "hull" of the fruit. The achenes are attached to 

 the receptacle a short distance above their base and the 

 styles arise from the ventral side, a little above the point of 



— cortex oi 

 ■ \dle 



medulla oi 

 receptacle 



achene 



Fig. 152. — Strawberry (Pragaria chiloensis). j4 ," fruit " in median length- 

 wise section, X 2M; B, single achene, X 20. 



attachment of fruit to receptacle. The achenes are com- 

 monly termed "seeds." 



Geographical. — The genus Fragaria possesses about eighteen species most 

 of which are natives of the north temperate zone; a number are found in 

 the Andes of South America. Strawberries are cultivated in all parts of 

 the United States. 



