Ask the Expert: what might this plant be?
Foud it in my wildflower garden next to False Sunflowers and New England
Asters. Might be a weed, Earl

Plant Expert Reply:

I believe it is a Acalypha virginica (Virginia threeseed mercury).  It is considered a weed with mild allergen properties.  It is a member of the Euphorbiaceae family.

Just a side note:  This plant is a sister to a houseplant called Chenille plant (Acalypha hispida).  Which just goes to show you one man’s weed is another man’s treasure.