Spines

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1. a sharp-pointed woody structure, usually a modified leaf or leaf part.

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Opuntiainvictaspines.jpg

Spines on Opuntia invicta

Source: http://www.botgard.ucla.edu mm_cactus_spines_4379.jpg The hard sometimes woody and sharp extremities of a plant. Source:http://www.livelyphotos.com