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Prickle

A more or less small, sharp-pointed outgrowth on the surface or edge of a stem or branch. Prickles may be straight or curving, sometimes flattened or sometimes broad-based.
 
Figure A.  Prickles on stem of common blackberry.
(Rubus allegheniensis)
 
Figure B.  Recurved prickles on branch of Virginia rose.
(Rosa virginiana)

 

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