boar thistle

Noun
  1. European thistle with rather large heads and prickly leaves;
    Extensively naturalized as a weed in the United States (synset 111975622)
    is a type of: plume thistle, plumed thistle - any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally white flower heads
    same as: bull thistle, cirsium lanceolatum, cirsium vulgare, spear thistle

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