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White Snakeroot
Although this can be used as a treatment for snakebite, hence the name, this is another plant to steer clear of if possible. Containing a harmful toxin called tremetol, if you eat this by mistake you will experience tremors, delirium and eventually death. It is thought that settlers in early-America suffered from the effects of this plant a lot as their cows would eat it when grazing and thus the substance would pass into the milk people would drink.