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Thornless Blackberry Buds

The thornless blackberry is of mixed ancestry, the progenitor from which the thornless quality is inherited being a wild dewberry. Thornlessness in a brier seems almost a contradiction of terms, but it will be seen that the buds and leaves have characteristic blackberry qualities.

Thornless Blackberry Buds

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 6 Chapter 1