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The "Signal" Cactus

This variety is characterized by having peculiarly long slender spiked slabs. A glance at almost any of the other pictures will show the distinction. This form is not particularly meritorious; but the variety has been preserved for its other good qualities and for use in future experiments.

The Signal Cactus

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 8 Chapter 7