PLATE 9. Varieties of turnips, all of which have been derived by cultivation from the wild 

 species, Brassica rapus, L., a member of the Mustard Family. 



I. " Early stone or stubble," green top. 2. " Chirk Castle black stone," dark purple. 3. " Long, 

 white Meaux or cowhorn," pale green top. 4. " Early, white, strap-leaved American," all white. 

 5. " Early Vertus or Jersey." Observe how these varieties differ in form. 



