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188 



IMPORTANT FAMILIES OF PLANTS 



mcrcial importance. Tliey are used in the preparation of foods 

 and also as medicines. Their nso antedates the Christian Era. 



Fig. 117. — The flat form of true turnip with white fie.sh. 



Field Turnips {B. campedris) and tiiie turnips {B. rapa) 

 (Fig. 117) are well known plants used for food for both man 

 and beast. They originated in northern Europe and Asia and 



