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Plants of the Eloise Butler Wildflower Garden
The oldest public wildflower garden in the United States

Common
Name

Scientific
Name

Plant
Family

Garden
Location

Prime
Season

Sweet Scented Joe-Pye Weed

Eutrochium purpureum (L.) E.E.Lamont

Former- Eupatorium purpureum L.

Aster (Asteraceae)
Upland
Late Summer to Early Autumn
Other names and notes

(Green-stemmed Joe-Pye Weed, Trumpet Weed, Gravel-root) Joe-Pye Weeds have leaves in whorls of 3 to 4 leaves on tall (from 3 to 7 feet) stout stems. Sweet-scented Joe-Pye Weed is a native erect perennial forb that has a solid stem, greenish, not spotted, with purple usually at the leaf nodes. The lower stem is usually without hair, the upper stem can have fine hair, including glandular hair, especially within the inflorescence. The plant has a vanilla scent when bruised hence the common name. Leaves are in whorls of 3 or 4, (sometimes 5) coarsely toothed, have a pinnate vein arrangement, with bases abruptly to gradually tapered. Lower stem leaves will have a stalk, upper leaves may be almost stalkless. The upper surfaces are usually without hair but the lower surface can range from sparsely hairy with gland dotting to densely hairy. The shapes vary from lanceolate to deltate-ovate. The inflorescence is a dome shaped branched doubly compound array composed of individual corymbs (clusters of flowers that appear flat-topped due to varying stalk length of each flower in the cluster). Each sub-part of the overall inflorescence is composed of several individually stalked corymbs. There can be smaller axillary clusters from the upper leaf whorl. Flowers: Each corymb has 4 to 7 small florets with purple to pale pink corollas (can occasionally be whitish in certain light conditions). The corolla has a tubular throat with 5 ovate lobes. Stamens number 5 and have whitish anthers. The styles are branched and protrude from the corolla. The flowerhead is cylindric in shape and has 4 to 5 series of oblong phyllaries, the inner series longer, the outer shorter, usually pink in color and occasionally hairy. Seed: Fertile florets produce a dry 5-ribbed seed with numerous long bristles for wind dispersion. Varieties: There are two accepted varieties of E. purpureum - var. purpureum where the lower leaf surface is hairy along the major veins and var. holzineri where the lower leaf surface is densely hairy. Minnesota authorities report only the latter is found in Minnesota.

Habitat: Sweet Scented Joe-Pye Weed grows from a fibrous root system in meadows, open woods with full to partial sun, moderate to dry moisture conditions and loamy soil. This is a native plant that grows well in the home garden as a backdrop specimen. While it will grow in partial sun, stems will be weaker and it will tend to lean toward bright light. Names: Recently, botanists have reclassified the species formerly in the genus Eupatorium that have whorled leaves into the genus Eutrochium, which name is derived from the Greek eu, meaning 'well' or 'truly' and trocho, meaning 'wheel-like', together referring to the whorled leaves. The species name, purpureum, is Latin for 'purple' or 'mottled'. The older genus name has a quite interesting story and that is found below along with the common name descriptions. The plant author name ‘E.E.Lamont’ is for Eric E. Lamont, American Botanist and Research Associate at the New York Botanical Garden who has published Taxonomy of Eupatorium Section Verticillata (Asteraceae). New York Botanical Garden Press. Comparisons: It has differences in the stem and in the flower arrangement from its relative, Spotted Joe-Pye Weed, Eutrochium maculatum, and also prefers a more moist habitat.

Sweet Joe-Pye Weed Group
flowers Sweet Joe-Pye Weed Stem
Above: Sweet-scented Joe Pye Weed has an rounded inflorescence composed on many individual corymbs that have 4 to 7 small purplish florets each. Above: The stem is usually greenish with purple only at the leaf nodes and close to and in the inflorescence there are fine hair.
Sweet Joe-Pye Weed
leaf underside
Above: The leaf structure. Left - the pinnate vein pattern is visible on the upper surface which is usually smooth. Right: The underside is densely hair in var. holzineri which is found in Minnesota.
Phyllaries Seed
Above: The phyllaries of the flower heads are in several series, the outer shorter - shown here in the fall. During flowering they are pink. Below: There are several small leafy bracts under the inflorescence. Above: The seeds are long and pointed with 5 ribs and with long fine bristles attached for wind dispersion. Below: Autumn seed heads.
bracts Sweet Joe-Pye Weed seed head
root
Left: The root system is fibrous.
   
 
 

Notes: Sweet-scented Joe-Pye weed is indigenous to the Garden. Eloise Butler noted it in bloom on several occasions: Aug. 2, 1910 and July 4, 1914. She made no record in her log of planting it. This plant was not listed on Martha Crone's 1951 inventory of plants in the Garden at that time but was added again in later years. It is native to a few counties in Minnesota in the NE section of the state and to counties in the SE quadrant including some metro countries but wild native plant surveys do not include it in Hennepin, Scott or Anoka, which is strange based on Miss Butler's notes. In North America it is found in the wild from the Central States eastward (excluding the Dakotas and Texas) and in the province of Ontario. It has far less distribution within Minnesota and in North America than the Spotted Joe-Pye Weed, Eutrochium maculatum. The two Joe-Pye Weeds are the only representatives of the genus found in Minnesota.

The common name seems to have the following consensus: The name could have come from an Indian medicine man in colonial New England known as “Joe Pye”. He had fame in using this plant to cure typhoid and several other diseases; or, since an Indian word for typhoid is “jopi”, the plant used to cure typhoid became the jopi weed which eventually worked it way into “Joe Pye.” Take your pick. In some parts of the country the plant is referred to as Queen of the Meadow, but we in Minnesota know a different plant by that name. Gravelroot is a name frequently found in old books, particularly those from Britain.

The older scientific name, Eupatorium, came from a Persian general, one Mithridates Eupator who is said to have used plants as a medicine and in his personal quest to become insensitive to poisons. By ingesting a slight amount of plant poisons each day along with various antidotes, Mithridates was able to build an immunity to many poisons, such that when he wished to commit suicide, poison would no longer work and he had to have his servant slay him by the sword. Mithridates died in 63 B.C. Long a friend of Rome, they moved apart and he was finally defeated in his own kingdom of Pontus in Asia Minor by Pompey, which battle earned Pompey the title “Pompey the Great.”

Lore and Uses: (Applies to both Spotted and Sweet Joe-Pye Weed The plant root is the main medicinal part of the plant as it contains some volatile oils and thus when powdered or made into a fluid extract, can be used as a diuretic and for internal ailments. The root is slightly bitter with an aromatic taste and slightly astringent. A decoction of the root is a remedy for problems of the bladder, kidney or urinary system (Hutchins Ref. #12). Densmore (Ref. #5) reports the Chippewa put some of the decoction in a fretful child's bath and sleep would be induced. The working compound in the root is Euparin with the chemical formula C12-H11-O3. Hot teas were made from the leaves and these were said to produce sweating to break a fever. The use of crushed leaves were said to improve the complexion and one legend has it that a young brave courting a young women was “assured” of success if he stuck a wad of the leaves in his mouth before he went visiting. Perhaps it had mouthwash effects as the leaves have a vanilla scent when crushed.

 
 

 
References: Plant characteristics are generally from sources 1A, 32, W2, W3, W7 & W8 plus others as specifically applies. Distribution principally from Wi, W2 and 28C. Planting history generally from 1, 4 & 4a. Other sources by specific reference. See Reference List for details.  
©2013 Friends of the Wild Flower Garden, Inc. Text and photos are by G. D. Bebeau unless otherwise credited. "www.friendsofthewildflowergarden.org" 111613