I belive I have the plain green and purple versions Of the snakeroot/Eupatolium as well:
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I don't know for sure what it is but to me it does look like "white snakeroot," which is blooming right now (at least here). I have some at the front of my property. Yes, it is poisonous, but much of nature is. As long as nothing is grazing on it, I wouldn't worry too much.
Agreed. I have tons of the white snakeroot. But there isn't a cow or a horse in miles, so I don't worry about it. I have never seen any sign that anything else gets sick from it. Apparently the groundhog knows not to eat it. All kinds of other stuff back there gets grazed down, but not the snakeroot.