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The Stalk of the Balloon Berry

The stalk of the balloon berry is very characteristic in form, being almost square. Like most other Rubuses, the balloon berry bears thorns, but the thorns are very small; probably they may be removed altogether by selecttve breeding.

The Stalk of the Balloon Berry

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 6 Chapter 5