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White Snakeroot vs Late Boneset

These plants often occur in the same habitat, and can be tricky to distinguish early in the season. They are more distinctive when blooming.

White Snakeroot (Ageratina altissima)

Late Boneset (Eupatorium serotinum)

A poisonous perennial herb native to eastern North America. One of the most common members of the Eupatorieae tribe of the aster family. In much of its range, among the last wildflowers to bloom in fall.
A perennial native to North America, this species has been expanding its range to the northeast in response to humans creating more open habitats.
Stout, compact growth habit. Plant branches more low down, inflorescence rarely extends beyond most of the plant.
Tall, narrow growth habit. Some plants branch little until the inflorescence. Branches of inflorescence spread widely; inflorescence often the broadest part of the plant.
Shorter, broader leaves.
Longer, narrower leaves.
Averages more florets per head: usually 12-25.
Averages fewer florets per head, usually 9-14.
Leaves flat or slightly wrinked around veins, but not consistently curved upwards.
Leaves often curve upwards at margins, especially higher up on the plant, often subtly evident on young plants.
More tolerant of shady, drier habitats.
Tends to be found in wetter, sunnier habitats.
Rarely grows more than 1.5 meters (5 feet) tall. Often much smaller.
Can grow up to 2 meters (6.5 feet) tall. Commonly at least 5 feet.