A Stage of Progress with Dahlias
This hybrid dahlia from Mr. Burbank's colony probably illustrates one of the stages through which the cultivated dahlias have passed within comparatively recent generations in the course of their development. Here, it will be seen, the ray flowers are encroaching on the center of the flower head, and the contrast between this double flower and its wild prototype is very striking.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 9 Chapter 7