Great or Giant Ragweed,  Ambrosia trifida
Asteraceae or Sunflower Family

Very tall herb, up to 15 feet tall.  Leaves deeply divided into three  lobes.  Flowers tiny, in crowded spikes at the top of the plant, green.  Blooms in late summer

Common native plant of moist places.  Much despised because its pollen, along with that of common ragweed, is the principal cause of autumn hayfever.

Common ragweed (Ambrosia artemisiifolia) has similar flowers (that also cause hayfever), but it is much smaller and its leaves are deeply dissected into many small segments.



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