Eupatorium purpureum L.
Sweet-scented Joe-Pye Weed, Sweet Joe-Pye Weed, Trumpet Weed
Sweetscented Joe-Pye (or possibly Joe-Pie) weed is native to North America. They prefer moist soil.
Identification: Plants are 5-8' (1.5-2.4 m) tall and 24-48" (60-121 cm) wide. Stems are rigid, round, and purple. Leaves up to 12" (30 cm) long and 3½" (9 cm) wide occur in whorls of 4-5 around the stem. The leaves are finely toothed. Dense flower clusters are dull pink or mauve in color. They appear from July to August.
Eupatorium purpureum on Missouriplants.com
Eupatorium purpureum at the Northeast School of Botanical Medicine (describes this and similar species)
Eupatorium purpureum at the University of Wisconsin's Robert W. Freckmann Herbarium
Eutrochium purpureum on Wikipedia
Eupatorium purpureum at the Lady Bird Johnson Wildflower Center
Eupatorium purpureum on Plants for a Future, a resource and information centre for edible and otherwise useful plants
Eupatorium purpureum description by Thomas H. Kent, last updated 19 Aug 2013.
Range: Zones 4-9: