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How are thorns distinguished botanically?

 
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Botanically, thorns are distinguished as modified stems (as in the honey locust and hawthorn) from spines, which are modified leaves (as in the barberry), and from prickles, which are epidermal outgrowths of the bark (as in the rose and blackberry) ...

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Get more facts and information about thorn from The Columbia Encyclopedia, 6th ed. at Encyclopedia.com.

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