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A Curious Fruit

This odd-shaped fruit is a cross between two stoneless plums. It has a large stone in the upper portion, with a hollow recess extending into the lower portion of the fruit. It is one of many interesting abnormalities observed in connection with the stoneless plum experiments.

A Curious Fruit

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