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Wikipedia: Thistle is the common name of a group of flowering plants characterised by leaves with sharp prickles on the margins, mostly in the family Asteraceae. Prickles often occur all over the plant - on surfaces such as those of the stem and flat parts of leaves. These are an adaptation that protects the plant against herbivorous animals, discouraging them from feeding on the plant.
![[A picture of Thistle]](http://images.ookaboo.com/photo/s/Thistle4_s.jpg "A picture of Thistle")
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