2024 Photograph, Common Ragweed, Annual Ragweed, or Low Ragweed (Ambrosia artemisiifolia, Aster family, Asteraceae), Occoquan Bay NWR, Woodbridge, Virginia, © 2024.
No petals because these flowers depend on the wind to distribute their pollen. Of course the more noticable Goldenrods get the credit for all the sneezing the Ragweed pollen causes.

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