Peas in the Pod
Some such variation as this you may discover if you will search among the pods on different vines of the peas in your garden. If you will use the Burbank method of selection, as fully described in the text, and have sufficient patience, you may develop fixed races of peas along any of the lines suggested by these varying pods. Mr. Burbank has never developed peas that were "square so they will not roll off the knife," as a popular Joke narrates; but he has developed lenticular peas, as well as round ones in great variety, and with widely varying characteristics.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 7 Chapter 3