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Absolutely Stoneless Plums

This still unnamed seedling is absolutely stoneless, and the kernel is somewhat enlarged, so that it almost completely fills the cavity. Although this particular variety may not be introduced, it will almost certainly become the progenitor of commercial varieties of stoneless plums.

Absolutely Stoneless Plums

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