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Perennials.  Typical height is from 3 to 4 feet.

Flower heads are discoid.  Ray florets are lacking.  Disc florets are white, tubular, bisexual and fertile.

Basal leaves are usually not present at flowering.

Plants of mesic to wet open areas, such as roadside ditches, low meadows, pond margins.  Flowers August to September.  Native.

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Similar species:  Ageratina altissima, as well as other members of the genus Eupatorium.

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