Synonym:  Eupatorium fistulosum

              

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Perennials.  Colony-forming under ideal conditions.  Stems are often hollow toward the base and sometimes above, usually purple (sometimes greenish), glaucous and glabrous toward the base, becoming glandular toward the summit.  Typical plant height is 3 to 6+ ft. (9 to 18+ dm).

The overall inflorescence is multi-tiered and compound, with numerous ascending branch inflorescences, each arising from leaf axils, each corymb-like.

Flower heads are of discoid.  Ray florets are lacking.  Floret corollas are pink to magenta, bisexual and fertile.

Basal leaves are typically deciduous by flowering.  Stem leaves are usually in whorls of 4 to 7 (at least lower to mid-stem leaves), lanceolate, toothed, thinly pubescent, and gradually taper at base to petioles.

Plants generally of open or open-wooded damp to wet places; roadside ditches, wet meadows and thickets.  Flowers August to September.  Native.

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Similar species:  other members of the genus Eutrochium.

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