thistle
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Some thistles are garden plants whilst others are troublesome weeds. Some varieties are used, in the young, nonspiny stage, as animal fodder.
Any of a group of prickly plants with spiny stems, soft cottony purple flower heads, and deeply indented leaves with prickly edges. The thistle is the national emblem of Scotland. (Genera include Carduus, Carlina, Onopordum, and Cirsium; family Compositae.)
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