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Spineless and Spiny of the Same Fraternity

These plants were grown from the seeds of a single cactus fruit. Three of them are perfectly spineless, while one is unusually spiny; but all have the long rounded form of the parent, which differed in this particular from most other plants of the same variety.

Spineless and Spiny of the Same Fraternity

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 8 Chapter 6