false ragweed

1 definition found

false ragweed - WordNet (r) 2.1 (2005) :

  false ragweed
      n 1: tall annual marsh elder common in moist rich soil in
           central North America that can cause contact dermatitis;
           produces much pollen that is a major cause of hay fever
           [syn: burweed marsh elder, false ragweed, Iva xanthifolia
           ]