• ragweed pollen

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  n : pollen of the ragweed plant is a common allergen
  
  

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  Synonyms | Related Words | Antonyms

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  pollen : the fine spores that contain male gametes and that are borne by an anther in a flowering plant
  pollen tube : slender tubular outgrown from a pollen grain that penetrates the ovule and releases male gametes
  pollen count : the number of pollen grains (usually ragweed) in a standard volume of air over a twenty-four hour period and a specified time and place
  ragweed : any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
  ragweed : widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
  common ragweed : annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally
  great ragweed : a coarse annual with some leaves deeply and palmately 3-cleft or 5-cleft
  perennial ragweed : coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
  false ragweed : tall annual marsh elder common in moist rich soil is central North America that can cause contact dermatitis; produces much pollen that is a major cause of hay fever
  
  

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