rag·wort 
(răgwûrt′, -wôrt′)
(răgwûrt′, -wôrt′)n.
Any of various plants in the composite family, chiefly of the genera Senecio and Packera, having yellow flower heads. S. jacobaea, a European species poisonous to livestock, is widely naturalized in North America and elsewhere.
[From the ragged shape of its leaves.]
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