Ageratina altissima (weed)
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Ageratina altissima (weed) (L.) King & H.E. Robins. - (white snakeroot)
This poisonous weed is native to North America and can be a problem in grasslands. It contains the substance tremetol which contaminates the milk of cattle feeding on the weed. Humans can develop "milk sickness" when drinking such milk. The weed has been accidentally introduced into South Korea where it is invasive in forest environments.
For details see the respective page in Wikipedia.