Parents and Offspring
At the right, a specimen of the Persian or English walnut; at the left, a specimen of the Japanese walnut, known as Juglans Seyboldt; in the center, a Burbank hybrid between these two species. It will be seen that the hybrid is much larger than either parent, and that it shows qualities of each, following the Persian parent in its general appearance, and the Japanese parent in the form of the shell.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 11 Chapter 2