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spine
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Spines of the ocotillo (Fouquieria splendens). (Top) The leaves begin to transform into spines. (Bottom) The blades fall off and the hardened petioles become spines. Clusters of leaves also develop at the axil of each spine.
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Spines of the ocotillo (Fouquieria splendens). (Top) The leaves begin to...
Β© Robert and Linda Mitchell