These three yellow flowers are heavy pollen producers.  The first two are of the Giant Ragweed.  The last is Sand Sage.  Both species are covered in more detail in the category “Plants on the Prairie — All other colors.”Giant Ragweed (Ambrosia trifida) Male Blooms

Giant Ragweed (Ambrosia trifida) Male  Blossoms

Sand Sage (Oligosporus filifolius) Blossoms

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