Source : WordNet®

dog fennel
     n 1: weedy plant of southeastern United States having divided
          leaves and long clusters of greenish flowers [syn: {Eupatorium
          capillifolium}]
     2: widespread rank-smelling weed having white-rayed flower
        heads with yellow discs [syn: {mayweed}, {stinking mayweed},
         {stinking chamomile}, {Anthemis cotula}]