Leaf Variations in a Hybrid
This very striking picture illustrates the range of variation that may be shown in a crossbred plant. The solid leaf at the left resembles the California dewberry; the leaf at the right shows the characteristics of the Oregon evergreen blackberry-these two being the parental forms. The segregation of ancestral hereditary factors is strikingly shown in these hybrid blackberries.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 6 Chapter 1