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Eupatorium altissimum L.
Life   Plantae   Dicotyledoneae   Asteraceae   Eupatorium

Eupatorium altissimum
© Les Mehrhoff, 2008-2010 · 3
Eupatorium altissimum

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Eupatorium altissimum, plant and flower
© Kay Yatskievych, 2003 · 1
Eupatorium altissimum, plant and flower

Associates · map
FamilyScientific name @ source (records)
Colletidae  Hylaeus mesillae @ BBSL (1)
Mycosphaerellaceae  Cercospora @ 431987B (1); 431987A (1)

Septoria eupatorii @ BPI (1)
Pucciniaceae  Puccinia inanipes @ BPI (1)

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Following modified from MissouriPlants.com
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Eupatorium altissimum  L.

Eupatorium altissimum plant

Family - Asteraceae

Stems - To +1.5m tall, erect, herbaceous, terete, simple below, branching in the apical 1/3, glabrescent below, tomentose above, green to tan.

Eupatorium altissimum stem

Leaves - Opposite, sessile, decussate, often with a smaller pair of leaves in the axils of the larger main leaves, to +10cm long, to 2cm broad, lanceolate to oblong-lanceolate to linear-lanceolate, coarse serrate in the apical 1/2 (at least on the lower leaves), green on both surfaces, with antrorsely bent pubescence, much more pubescent abaxially, with 3 main veins arising at the very base of the leaf blade. Other veins of the leaves anastomosing before the margin of the blade. Margins antrorse ciliolate.

Eupatorium altissimum leaves

Inflorescence - Multiple flowerheads in a corymbose arrangement terminating the stem. Each division of the inflorescence subtended by a pair of reduced bracts. Bracts foliaceous.

Eupatorium altissimum inflorescence A portion of the inflorescence.

Involucre - 5mm long (tall), +/-2mm in diameter, cylindric. Outer phyllaries smaller than the inner. Inner phyllaries to 5mm long, 1.4mm broad, tomentose externally glabrous internally, with a scarious-white margin, with 3 darker green veins (use a lens to see), with a solid green apex, linear to oblanceolate, rounded at the apex.

Eupatorium altissimum involucre Involucre.

Ray flowers - Absent.

Disk flowers - Flowerheads with 4-7 flowers. Corolla white in the apical 1/2, green basally, 4mm long, glabrous internally and externally, expanded in the apical 1/2, 5-lobed. Lobes acute, 1mm long, .5mm broad at the base, erect to spreading. Stamens 5, adnate at the apex of the contracted portion of the corolla tube. Filaments white, glabrous, compressed, .7mm long. Anthers purplish, to 1.2mm long, connate around the style, partially exserted. Style glabrous, green basally, white apically, to +/-6mm long, bifurcate in the apical 3mm (the divisions erect). Achenes green in flower, 2-2.2mm long, glabrous, terete or 5-sided. Pappus of capillary bristles. Bristles antrorse barbellate, white, 4-5mm long. Receptacle naked.

Eupatorium altissimum flowers

Flowering - August - October.

Habitat - Prairies, glades, thickets, open rocky wood, waste ground, fallow fields.

Origin - Native to U.S.

Other info. - This species can be found throughout much of Missouri but is mostly absent in the southeastern corner of the state. This is a non-distinct plant and many would consider it a weed. " altissimum " means "tallest" but this is not the tallest species of the genus, there are many which generally exceed its height. The plant is not difficult to identify but it can be confused with the similar members of the genus. The tomentose stems, 3 main leaf veins, and rounded phyllaries help to identify it correctly. Plants growing in full sun are much more stout, have more leaves, and have bigger inflorescences than do plants growing in the shade or in wooded areas.

Photographs taken in Eminence, MO., 9-21-03, and at Tall Grass Prairie National Preserve, KS., 9-20-06 .

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Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=EUAL3 ---> https://plants.usda.gov/java/profile?symbol=EUAL3
https://plants.usda.gov/java/profile?symbol=EUAL3 ---> http://plants.usda.gov/core/profile?symbol=EUAL3
http://plants.usda.gov/core/profile?symbol=EUAL3 ---> https://plants.usda.gov/core/profile?symbol=EUAL3
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You are here: Home / Plant Profile

Eupatorium altissimum L.
tall thoroughwort

Image of Eupatorium altissimum

General Information
Symbol: EUAL3
Group: Dicot
Family: Asteraceae
Duration: Perennial
Growth Habit : Forb/herb
Native Status : CAN   N
L48   N
Data Source and Documentation
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Plants-NRCS Logos
green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   


click on a thumbnail to view an image, or see all the Eupatorium thumbnails at the Plants Gallery

Jennifer Anderson. United States, IA, Scott Co., Davenport, Nahant Marsh. 2001. Usage Requirements .

©Thomas G. Barnes. Barnes, T.G., and S.W. Francis. 2004. Wildflowers and ferns of Kentucky . University Press of Kentucky. Usage Requirements .

Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory . United States, VA, Clarendon. Usage Requirements .

Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 3: 359. Provided by Kentucky Native Plant Society . Scanned by Omnitek Inc . Usage Requirements .



Symbol Scientific Name
EUSA5 Eupatorium saltuense Fernald, non Agertina altissima (L.) R.M. King & H. Rob.


Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Asteridae
Order Asterales
Family Asteraceae ⁄ Compositae – Aster family
Genus Eupatorium L. – thoroughwort
Species Eupatorium altissimum L. – tall thoroughwort

Subordinate Taxa

This plant has no children

Legal Status

U.S. Weed Information
Eupatorium altissimum tall joepyeweed tall thoroughwort This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of Weeds of the U.S.
NE&GP Stubbendieck, J., G.Y. Friisoe,and M.R. Bolick. 1994. Weeds of Nebraska and the Great Plains . Nebraska Department of Agriculture, Bureau of Plant Industry. Lincoln, Nebraska.

Wetland Status

Interpreting Wetland Status

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (EUAL3)
Integrated Taxonomic Information System (EUAL3)
Integrated Taxonomic Information System (EUSA5)
Lady Bird Johnson Wildflower Center Native Plant Information Network (EUAL3)
USF Atlas of Florida Vascular Plants (EUAL3)
University of Tennessee Herbarium (Distribution) (EUAL3)
University of Wisconsin - Stevens Point Freckmann Herbarium (EUAL3)



Source Large Mammals Small Mammals Water Birds Terrestrial Birds


Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover

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