Pure Bred and Hybrid Compared
The front box shows second-generation hybrids of the Balloon Berry and Hawaiian raspberry, like those shown in the preceding picture. The box in the rear shows the Hawaiian raspberry unmodified. A comparision of the two types of leaves gives a good idea of the modification effected by hybridization. There is, of course, a considerable range of variation among the second-generation hybrids, giving opportunity for selection.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 6 Chapter 5