Fig. 77. Variation in leaves of hybrid blackberries, all from the seed of one 

 plant. The stems of the plants varied just as much in shape, size and 

 color. The parents of these forms were Oregon Evergreen and Lawton. 

 Many new forms are produced in this way. A thousand or more forms may 

 be produced and discarded without finding even one having real merit. 

 (H 212.) After photograph by Luther Burbank. 



