Eupatorium altissimum

Eupatorium altissimum (tall thoroughwort) is a perennial plant whose native range includes much of the eastern and central United States and Canada (Ontario south to Nebraska, eastern Texas, the Florida Panhandle, and Massachusetts. It almost always grows on limestone soils, as does Brickellia eupatorioides, with which it is often confused. It can hybridize with Eupatorium serotinum.

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• Tall boneset eupatorium altissimum
• Tall boneset i eupatorium altissimum
• References

Eupatorium altissimum is a perennial herb sometimes more than 150 cm (5 feet) tall. Leaves and stems are covered with whitish hairs. The plant produces a large number of small white flower heads in a large flat-topped array at the top of the plant. Each head generally has 5 disc florets but no ray florets.

Eupatorium altissimum is part of Eupatorium even when that genus is defined narrowly to include about 40 species of mostly white-flowered plants of North America, Asia, and Europe.