|Eutrochium fistulosum with a butterfly|
Eutrochium fistulosum (Eupatorium fistulosum), also called hollow Joe-Pye weed, trumpetweed, or purple thoroughwort, is a North American flowering plant in the sunflower family. It is native to southern Canada and throughout the eastern and south central United States from Maine west to Ontario, Wisconsin, and Missouri and south as far as Florida and Texas. The species name fistulosum refers to the tubular stem; see fistula.
Eutrochium fistulosum is a herbaceous perennial plant sometimes as much as 350 cm (140 in; 11 ft 6 in) tall. It is found in moist, rich soil alongside ditches and marshes, or in wet forests. It flowers from mid-summer to the first frosts, makes an attractive backdrop in garden plots, and is very attractive to butterflies, bees, and other nectar-feeding insects.
The plant has one simple erect stem, which is green with purple dots or longitudinal dashes. The upper stems are reddish or purplish. Leaves and primary subdivisions of the flower head appear in whorls of 3–5 (rarely 2 or 6, the rotational symmetry of most plants is consistent). Leaves are large, long and sharply toothed. One plant can produce several flower heads in a branching array, each head with 4-7 pink or purple disc flowers but no ray flowers.
- "Eutrochium fistulosum (Barratt) E.E.Lamont". The Global Compositae Checklist (GCC). Retrieved 12 May 2015 – via The Plant List.
- "Eutrochium fistulosum (Barratt) E.E. Lamont". Tropicos. Missouri Botanical Garden.
- "Eutrochium fistulosum". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 9 June 2014.
- Lamont, Eric E. (2006). "Eutrochium fistulosum". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). 21. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
- "Eutrochium fistulosum". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
- Blanchan, Neltje (2005). Wild Flowers Worth Knowing. Project Gutenberg Literary Archive Foundation.
- Tew, James Some Ohio Nectar and Pollen Producing Plants Ohio State University Extension Factsheet
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