What some people call Ragweed, us southerners call Goldenrod.

What my Grandmother called ragweed was actually Ageratum.

I think the late summer/fall blooming Goldenrod is probably the public enemy #1 allergen.

Ragweed is so notorious for causing rhinitis in late summer early fall that some fool(s), who obviously were not allergic to Ragweed pollen, introduced Ragweed into Europe where it has become naturalized and become an invasive species in some areas.

Ragweed belongs to the genus Ambrosia.

Ambrosia is the food or drink of the Greek gods on Mount Olympus served by Hebe, before her marriage to Herakles, and Ganymede, the most beautiful youth of Troy who was abducted by Zeus to be his personal cup-bearer.

Goldenrod is unfairly accused of being allergenic.  It blooms at the same time as ragweed, which is. https://hgic.clemson.edu/how-to-tell-the-difference-between-goldenrod-and-ragweed/#:~:text=Goldenrod has characteristic bright yellow flowers.&text=Ragweed has inconspicuous flowers that,that blows in the wind.