360 



BOTANY OF CROP PLANTS 



which spring from the crown of the plant. The flowers are 

 usually perfect; however, there are some varieties (Bisel, 

 Princess, Warfield, etc.) which have only pistillate flowers 

 (Fig. 150); there are no commercial varieties that have only 

 staminate flowers. In planting varieties with pistillate 

 flowers only, it is necessary to have rows near-by planted to 

 pollen-bearing individuals. Some perfect-flowered varieties 



\ 



- achene 

 -calm lobe 



^^^ Ttm of receptacle 

 yeskj recepfacle 



Fig. 151. — Strawberry (Fragaria chiloensis). 



flower. X 4. 



Median lengthwise section of 



(Glen Mary and Crescent) bear very few stamens, and hence 

 are practically self-sterile. The receptacle is convex or con- 

 ical (Fig. 151). The calyx is five-parted, with five bracteoles 

 (epicalyx) below, that are persistent in the fruit. There 

 are five obovate, short-clawed petals, attached to the rim of 



