LUTHER BURBANK 



utilized in the course of my hybridizing experi- 

 ments. 



But perhaps the chief favorite among Amer- 

 ican raspberries is the one introduced in the early 

 forties by Nicholas Longworth, of Ohio, and 

 known as the Wild Black or Black-cap Raspberry, 

 Rubus occidenialis. 



This berry was a great addition to the list of 

 cultivated fruits. It soon became a favorite ev- 

 erywhere it could be successfully grown. Mr. 

 Longworth himself introduced it into England, 

 but it did not thrive in the English climate and 

 it never competed with the native European 

 species. 



INTERBREEDING THE RASPBERRIES 



The familiar cultivated raspberries of the pres- 

 ent time owe their origin to the species just 

 named, and to two other allied species, one our 

 wild red raspberry, Rubus strigosus, a close rela- 

 tive of the common European species, the other 

 known as Rubus leucodermis, a western relative 

 of the familiar black-cap. 



All the red raspberries now under cultivation 

 have sprung from either the European or Amer- 

 ican red species. The Purple-cane type appar- 

 ently sprang from the Rubus neglectus (very 

 probably a hybrid between R. strigosus and R. 

 occidentalis) ; such varieties as the Reliance, Shaf- 



[42] 



