Giant Rhubarb and Crimson Rhubarb
The original winter rhubarb had a stalk no larger than a lead pencil. By selective breeding Mr. burbank improved the plant until it was of marketable size, while retaining the quality of winter bearing that was about the only merit of the original. Subsequently Mr. burbank developed descendants of this original stock that were of gigantic size, excelling his original winter rhubarb somewhat as that excelled its New Zealand ancestor. The contrast is shown in this picture.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 2 Chapter 6