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The above represents the two main defense strategies of cacti in a harsh environment. Spines out the wazoo in the back row. From left to right: Thelocactus bicolor v. falvidispinus, Thelocactus bicolor, Glandulicactus wrightii. The front row...don't they look tasty, inviting, chewable? The stems are loaded with toxic, bitter alkaloids. From left to right: Ariocarpus kotschoubeyanus v. macdowellii, Ariocarpus fissuratus, Ariocarpus trigonus.
So which are you? Spines or alkaloids? (Not to say some cacti don't have both...)
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