Eutrochium dubium (Willdenow ex Poiret) E.E. Lamont. Common name: Three-nerved Joe-pye-weed. Phenology: Jul-Oct. Habitat: Swamp forests, pocosins, small stream margins and streamheads, other wet, acidic habitats. Distribution: NS, s. ME, and NH south to se. SC, on or near the Coastal Plain. Reported as adventive in West Virginia (Harmon, Ford-Werntz, & Grafton 2006).
Origin/Endemic status: Native
Synonymy ⓘ: = FNA21, K4, NE, NY, Pa, Va, Lamont (2004); = Eupatoriadelphus dubius (Willd. ex Poir.) King & H.Rob. — GW2, Schmidt & Schilling (2000); = Eupatorium dubium Willd. ex Poir. — C, F, G, RAB, SE1, Tat, W, Lamont (1995); = Eupatorium purpureum L. — S, misapplied. Basionym: Eupatorium dubium Willd. ex Poir. 1812
Links to other floras: = Eutrochium dubium - FNA21
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Wetland Indicator Status:
- Atlantic and Gulf Coastal Plain: FACW
- Eastern Mountains and Piedmont: FACW
- Northcentral & Northeast: FACW
Heliophily ⓘ: 5
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© Will Stuart | Original Image ⭷
© Scott Ward | Original Image ⭷
© Gary P. Fleming | Original Image ⭷
© Gary P. Fleming | Original Image ⭷
© Bruce A. Sorrie | Original Image ⭷
© Will Stuart | Original Image ⭷
© Will Stuart | Original Image ⭷
© Gary P. Fleming | Original Image ⭷Feedback
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Horticultural Information
Intro: Erect perennial of swamp forests, pocosins and other wet, acidic habitats.
Stems: Stems unbranched, solid or hollow, purple-spotted or -tinted, sticky-hairy toward the top.
Leaves: Leaves in whorls of 3-4, petiolate, lance-shaped or oval with wedge-shaped base, 2-6 in. long, sharply toothed, usually rough above and gland-dotted beneath.
Inforescence:
Flowers: Composite flowers (heads) in small clusters within a large, branching, terminal cluster; heads 1/4-3/8 in. long, consisting of 4-12 small, reddish-purple, tubular florets.
Fruits:
Comments: Butterflies and hummingbirds are drawn to the nectar of this species.
Height: 3-4 ft.
plant sale text: Coastal Plain Joe-pye-weed grows to 4 feet. Its shorter height makes it a wonderful alternative for smaller spaces, in the middle of a border, or in mass in a pot. A slow spreader, it grows into a clump 2-4 feet wide, achieving its greatest width in moist, fertile sites. Once established, it will tolerate short periods of drought. Many butterflies (swallowtails, monarchs, etc.) and hummingbirds love to feast on its giant, mauve flowers that bloom from August to October.
bloom table text:
description: Erect perennial of swamp forests, pocosins and other wet, acidic habitats.
stems: Stems unbranched, solid or hollow, purple-spotted or -tinted, sticky-hairy toward the top.
leaves: Leaves in whorls of 3-4, petiolate, lance-shaped or oval with wedge-shaped base, 2-6 in. long, sharply toothed, usually rough above and gland-dotted beneath.
inflorescence:
flowers: Composite flowers (heads) in small clusters within a large, branching, terminal cluster; heads 1/4-3/8 in. long, consisting of 4-12 small, reddish-purple, tubular florets.
fruits:
comments: Butterflies and hummingbirds are drawn to the nectar of this species.
cultural notes:
germination code:
native range: eastern United States & Canada
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