Eupatorium sessilifolium
from Nearctica
Identification: Flowers white, arranged in a flat-topped cluster. Leaves elongate with a tapering apex and toothed outer margin. Bases of the leaves sessile to the stem, but taper toward the base and do not wrap around the stem. Plant 2 to 6 feet in height.
Distribution: Minnesota in the west to New England in the east, southward to Georgia and Arkansas.
Habitat: Upland Boneset is found in woods and hills, away from wet habitats
Flowering period: July to September