Eutrochium fistulosum (Eupatorium fistulosum), also called hollow Joe-Pye weed, trumpetweed, or purple thoroughwort, is a perennial North American flowering plant in the family Asteraceae. 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 specific name fistulosum refers to the tubular stem; see fistula. Eutrochium fistulosum is a herbaceous perennial plant sometimes as much as 350 cm 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.Tew, James Some Ohio Nectar and Pollen Producing Plants Ohio State University Extension Factsheet In addition, it is a larval host to the Clymene moth, eupatorium borer moth, ruby tiger moth, and the three-lined flower moth.The Xerces Society (2016), Gardening for Butterflies: How You Can Attract and Protect Beautiful, Beneficial Insects, Timber Press. The plant has one simple erect stem, which is green with purple dots or longitudinal dashes and can grow over six feet tall. 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. 3-fold symmetry 4-fold symmetry 5-fold symmetry 6-fold (uncommon) Stem sections
No narrative description available for this taxon yet.
Compounds documented for Eutrochium fistulosum across natural-product and food-composition databases — not just the ~150 nutrients on a classic label ("nutritional dark matter").
A DNA barcode is a short, standardised stretch of genes that works like a fingerprint — enough to tell one species from another. Below is the molecular trace Eutrochium fistulosum has left across the world's sequence archives.
At a glance
DNA specimens16
Marker genes3
eDNA detections9
Countries2
Marker genes sequenced
★ the standard DNA barcode for this group — the short region actually read to tell this species apart. The rest are extra genes sequenced along the way.
★rbcLa★ITS★ITS2
plant barcodefungal barcode
06Genome at a glanceCCDB
The complete instruction manualEutrochium fistulosum carries — its genome. We read it from three angles — how big it is, how the DNA is packed into chromosomes, and how completely it has been sequenced — and explain how to read each value as you go.
Chromosomes & ploidyhow the DNA is packaged
2n is the full chromosome count in a normal body cell; n is a gamete (egg or sperm), which carries half. Ploidy is how many complete chromosome sets each cell holds — 2× (diploid) is typical for animals, while higher levels (polyploidy) are common in plants. Click any value below to see the underlying records and sources.
Chromosomes2n = 20 n = 10
Ploidydiploid inferred
Chromosome-count records — grouped by value · 2n = full set, n = gamete · click a value for sources & references
2n 201×CCDB · eflora
CCDB · eflora
Ploidy records — measured levels and diploid/polyploid inferences · click for sources
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
Coordinate accuracy86% within 1 km
≤100 m 2 115≤1 km 373≤10 km 163>10 km 246
2 897 georeferenced · 572 without coordinates
Open the mapobservation + sensor3 469
Museum / Voucheredphysical evidence
Backed by a physical specimen — a herbarium sheet, sample or voucher held in a collection. “Vouchered” means supported by material evidence, not just an observation.
Coordinate accuracy41% within 1 km
≤100 m 66≤1 km 319≤10 km 448>10 km 98
931 georeferenced · 214 without coordinates
Open the institutions mapphysical evidence1 145
Cultivated / Captivenot free-living
A living individual in a botanical garden, zoo or nursery — cultivated or kept, not free-living.
Coordinate accuracy
no georeferenced coordinates · 1 records without
Open the mapnot free-living1
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
10Collections & institutions
Holding institutions34 of 52 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Chongqing Museumlocation not on record
396
Philadelphia, US
354
Bangkok, TH
86
Bloomington, US
55
Jackson, US
23
Wuzhou, CN
14
College Park, US
14
Tampa, US
12
Little Rock, US
8
Chapel Hill, US
8
Mississippi State, US
8
Western Carolina Universitylocation not on record
7
Bronx, US
7
Norfolk, US
7
University of New Hampshirelocation not on record
7
Royal Ontario Museum, Green Plant Herbarium (TRT)location not on record
6
Millersville, US
6
US
5
Williamsburg, US
5
University of Tennessee at Chattanoogalocation not on record
5
Saint Louis, US
4
AUAlocation not on record
4
Fairfax, US
4
Asheville, US
4
Durham, US
3
Philadelphia, US
3
DOI/NPS, Greenbelt Parklocation not on record
2
Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record
2
Fayetteville, US
2
Dekalb, US
2
University of Stellenboschlocation not on record
2
GAlocation not on record
2
Flagstaff, US
2
Appalachian State Universitylocation not on record
2
Tuscaloosa, US
2
Burlington, US
2
Richmond, US
2
Johnson City, US
2
Tennessee Technological Universitylocation not on record
2
Riverside, US
1
University of Guelph, OAC Herbariumlocation not on record
1
University of Southern Mississippilocation not on record
1
State University of New York, College at Oneontalocation not on record
1
University of South Carolina Salkehatchielocation not on record
1
Minia, EG
1
Pittsburg, US
1
Emporia, US
1
Whitewater, US
1
San Angelo, US
1
Columbia, US
1
GBS RAN - Glavny Botanichesky Sad Rossijskoj Akademii Nauklocation not on record
1
Lord Fairfax Community Collegelocation not on record
1
52 institutions · 1 094 of 1 145 vouchered records shown · 51 without an institution code
Cultivated / Captivenot free-living
A living individual in a botanical garden, zoo or nursery — cultivated or kept, not free-living.
09Environmental DNA9 detections
Where the DNA of Eutrochium fistulosum was picked up in samples of water, soil or air — nobody saw the organism, only its DNA left behind. A trace is a clue that the species was near, not a confirmed sighting.
Signal
Detections DNA found9
Studies independent surveys1
Countries2
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 9 detections have coordinates
Open the map2 countries0
How strong is each trace?
DNA read depthRead counts were not reported for this species — the map shows presence only, not how strong each trace was.
Modelled climatemodelled
−15°Ctemperature across detection sites+40°C
Temperature median25.7 °C 16.1–25.7
Seasonal swing summer↔winter27.0 °C
Max temp (day)31.2 °C 19.6–31.2
Min temp (night)21.2 °C 13.6–21.2
Precipitation117 mm/mo 103–122
Air humidity56.9 % 56.9–58.1
Moisture balance-100 mm/mo -100–-26.1
Vapour deficit1,423 Pa 779–1,423
Wind speed5.10 m/s 4.40–5.50
Cloud cover24.9 % 24.9–43.0
CHELSA 1981–2010, ~9 km grid, at location & month of 7 detection points · median with p10–p90 · reflects where sampling happened, not only the true niche
How to read this: each dot is one detection of this species' DNA in an environmental sample. The confidence meter weighs how many independent studies and places back up the signal — one detection in one study is a hint; many across several studies is solid. Records dated before 2008 (when eDNA methods began) are treated as likely mislabeled and left off the map.
WikipediaWikimedia Foundation2 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility4 617 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI9 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics16 specimens↗
LOTUSNatural Products (Wikidata)compounds↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
Open Tree of LifeOpenTreephylogeny backbone↗
CCDBChromosome Counts DB · Tel Aviv U.genome & karyotype↗
PloiDBPloidy Databasegenome & karyotype
GLoBIGlobal Biotic Interactionsbiotic interactions↗