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dog fennel

  1. an annual weed (Anthemis cotula) of the composite family, having daisylike flower heads with white rays and yellow centers, and an offensive smell; mayweed
  2. ☆ a tall, annual weed (Eupatorium capillifolium) of the composite family, with finely divided leaves and a terminal cluster of tiny, rayless flower heads
  3. heath aster

See dog fennel in American Heritage Dictionary 4

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