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Updated: May 8, 2025
The purpose of these hooked spines seems doubtful; certainly, they cannot serve as any protection to the plant itself, as they are so strong that the plant must be torn up by the roots before the hooks will give way. The spines in M. macromeris are straight, and measure 2 in. in length; in M. multiceps they are in two series, the one fine, white, and short, the other yellow and stout.
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