Ageratina altissima (weed)

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Ageratina altissima (click on image to enlarge it)
Author(s): H. Zell
Source: Wikimedia Commons
Ageratina altissima - flowers (click on image to enlarge it)
Author(s): David Stephens
Source: IPM Images

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.

Synonyms:
Eupatorium rugosum

For details see the respective page in Wikipedia.