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A Wickson Hybrid

The plum here shown duplicates in many ways the appearance of the Wickson parent, although it shows perhaps a greater tendency to assume the form of the Kelsey. It is not as palatable as it looks; it is shown as illustrating how a crossbred fruit may simulate the appearance of its most valuable parent, and yet have no commercial value.

A Wickson Hybrid

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 5 Chapter 2