Thorns, spines, and prickles
Hard, rigid extensions or modifications of leaves, roots, stems or buds with sharp, stiff ends / From Wikipedia, the free encyclopedia
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In plant morphology, thorns, spines, and prickles, and in general spinose structures (sometimes called spinose teeth or spinose apical processes), are hard, rigid extensions or modifications of leaves, roots, stems, or buds with sharp, stiff ends, and generally serve the same function: physically defending plants against herbivory.