Plant Index


 
 
 
 

Eupatorium rotundifolium

Eupatorium rotundifolium L.

roundleaf thoroughwort, common roundleaf eupatorium

Eupatorium rotundifolium (Roundleaf Thoroughwort)
Image ID: 14436
Image by: Sorrie, Bruce A.
Image Collection: NCBG Digital Library

PLANT INDEX

ID_PLANT: EURO4
SCIENTIFIC NAME: Eupatorium rotundifolium
Include in WOTAS: 1
Publish to Web: 1
Last Modified: 2018-09-25

GENUS INDEX

GENUS CODE: EUPAT
GENUS SCIENTIFIC: Eupatorium
GENUS AUTHORITY: L.
GENUS COMMON: Thoroughwort
GENUS SUMMARY: A genus of about 40 species, herbs, of e. North America and Eurasia (after the exclusion of Ageratina, Chromolaena, Conoclinium, Eutrochium, Fleischmannia, and other genera). I have differed considerably from Cronquists treatments, as for instance in SE, regarding the rank at which to recognize taxonomic entities in Eupatorium. In the Southeastern United States, Eupatorium is a reticulately evolved complex, including diploids, triploids, and tetraploids; derivatives of hybridization produce sterile pollen but in some cases reproduce vigorously via agamospermous production of seeds. In some cases, these entities form separate populations from their presumed parental species, with distinctive ranges and habitats and more-or-less distinctive morphology. Cronquist treats morphologically highly distinctive entities, such as E. pinnatifidum, as full species, while stating that they are not long-persistent. He treats morphologically more subtle entities as varieties of one of the two presumed parental species, such as E. album var. vaseyi (very probably derived by hybridization of E. album var. album and E. sessilifolium). Other entities, difficult to distinguish morphologically from another species, he does not recognize, as for instance E. saltuense, included as a synonym under E. altissimum (E. saltuense may reflect hybridization between E. altissimum and some other species such as E. album, or possibly between E. hyssopifolium and E. album].
GENUS IDENTIFICATION:
GENUS REFERENCES: Siripun & Schilling in FNA (2006c); Schilling (2011)=Y; Cronquist (1980)=SE; Godfrey (1949). The key adapted from those references. (also see Ageratina, Chromolaena, Conoclinium, Eutrochium, Fleischmannia)

FAMILY INDEX

FAMILY CODE: ASTERA
FAMILY SCIENTIFIC: Asteraceae
FAMILY AUTHORITY: Dumortier 1822 or COMPOSITAE Giseke 1792
FAMILY COMMON: Aster Family
FAMILY SUMMARY: A family of about 1500-1700 genera and 20,000-25,000 species, shrubs, herbs, trees, and vines, cosmopolitan in distribution.
FAMILY REFERENCE: Cronquist (1980)=SE throughout family treatment.

NCBG DESCRIPTIVES

INTRO: Erect perennial of savannas, seepage bogs, woodlands, interdune swales, old fields and roadsides.
STEMS: Stems 1-2 from a short crown, sparsely branched above and densely hairy, especially above.
LEAVES: Leaves mostly opposite, sessile, oval to triangular with somewhat rounded tip and nearly flat base, 1-1 1/2 times long as wide, with the principal pair of lateral veins diverging directly from the base of the midrib, round-toothed, rough-hairy above and gland-dotted and veiny beneath.
INFLORESCENCE:
FLOWERS: Small composite flowers (heads) arranged in clusters at branch tips, the branches and stalks hairy and glandular; heads about 1/4 in. wide and consisting of 5 white, tubular disk florets. 2 or 3 series of tiny, pointed bracts surround the base of each head.
FRUITS:
COMMENTS:
HEIGHT: 3-4 1/2 ft.

DURATION: Perennial
HABIT: Herb

LEAF ARRANGEMENT: Opposite
LEAF COMPLEXITY: Simple
LEAF RETENTION:

FLORAL CHARACTERISTICS
SYMMETRY: Mixed
BLOOM TIME: Aug-Oct
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
x x x x x

BLOOM COLOR: White
White Red Pink Orange Yellow Green Blue Lavender Purple Violet Brown Not Applicable
x

FRUITING PERIOD:

DISTRIBUTION
HABITAT TYPE: Bogs/pocosins, Disturbed, Pine savannas, Woods margins
NATIVE RANGE: eastern North America

HORTICULTURAL
Plant Sale Text: With interesting ovate to heart-shaped leaves that hug the stem in pairs and a showy flat-topped clump of white flowers, Roundleaf thoroughwort is a worthy addition to the garden. Found throughout the state of North Carolina, it is easy to establish and more compact than other species of Eupatorium such as boneset. Fluffy seeds provide winter interest for this mid-sized Eupatorium.

Bloom Table Text:

NCBG Location:

Cultural Notes:

SOIL MOISTURE: Dry, Average, Moist/Wet
LIGHT EXPOSURE: Sun, Part Shade
MINIMUM HARDINESS ZONE: 4
MAXIMUM HARDINESS ZONE: 8
GERMINATION CODE: 2
WILDLIFE VALUE: Bee Friendly, Butterfly Friendly
DEER RESISTANCE:

GRIM ACCESSIONS

acc_id acc_num acc_dt coll_id Action
292 2011-0155 2011-06-16 297 View
1932 1986-1718 View
4394 1992-0550 View


GRIM COLLECTIONS

Coll_id Project Collection date Collector Action
297 HORT 2009-01-01 NCBG staff View
2207 NPMD 2019-09-09 Touloupas View
2223 NPMD 2019-09-11 Touloupas View
2268 NPMD 2019-10-01 Touloupas View
2537 NPMD 2021-10-19 Pil View
2552 NPMD 2021-10-06 Boyette View


GRIM PLANTINGS

plt_num acc_id loc_num pers_num inst_dt Action
683 292 21 NCBG staff 2011-04-08 View
3072 1932 64 NCBG staff 1986-12-22 View
6722 4394 200 NCBG staff 1993-03-01 View

USDA PLANTS DATABASE

USDA Symbol: EURO4
USDA Common Name: Roundleaf Thoroughwort
Native Status: L48 (N)
Distribution: USA (AL, AR, CT, DC, DE, FL, GA, IN, KY, LA, MA, MD, ME, MO, MS, NC, NH, NJ, NY, OH, OK, PA, RI, SC, TN, TX, VA, WV)
Duration: Perennial
Growth Habit: Forb/herb

NATIONAL WETLAND INDICATOR STATUS

Region:AGCPAKAWCBEMPGPHIMWNCNEWMVE
Status: FAC FAC FAC FAC FAC

This information is derived from the U.S. Army Corps of Engineers 2016 National Wetland Plant List, Version 3.3 (Lichvar, R.W., D.L. Banks, W.N. Kirchner, and N.C. Melvin. 2016. The National Wetland Plant List: 2016 wetland ratings. Phytoneuron 2016-30: 1-17. Published 28 April 2016. ISSN 2153 733X). Regions: AGCP-Atlantic and Gulf Coastal Plain, AK-Alaska, AW-Arid West, CB-Caribbean, EMP-Eastern Mountains and Piedmont, GP-Great Plains, HI-Hawaii, MW-Midwest, NCNE-Northcentral and Northeast, WMCV-Western Mountains, Valleys & Coast

WEAKLEY FLORA

SCIENTIFIC NAME: Eupatorium rotundifolium
COMMON NAME: Common Roundleaf Eupatorium
SYNONYMY: [= F, S, Va; = E. rotundifolium var. rotundifolium - C, FNA, G, K, Pa, RAB, SE, W; < E. rotundifolium - GW, WH3 (also see E. pubescens and E. cordigerum); E. rotundifolium Linnaeus ssp. rotundifolium]
PHENOLOGY: Aug-Oct.
HABITAT: Savannas, seepage bogs, woodlands.
COMMENTS: MA, NY, IN, and OK south to s. FL and TX.
RANGE MAP: Eupatorium rotundifolium.png

Key to Map Symbols
ABOUT FAMILY (Weakley Flora)
Asteraceae Dumortier 1822 or COMPOSITAE Giseke 1792 (Aster Family)
SUMMARY: A family of about 1500-1700 genera and 20,000-25,000 species, shrubs, herbs, trees, and vines, cosmopolitan in distribution.
REFERENCE: Cronquist (1980)=SE throughout family treatment.
ABOUT GENUS (Weakley Flora)
Eupatorium L. (Thoroughwort)
SUMMARY: A genus of about 40 species, herbs, of e. North America and Eurasia (after the exclusion of Ageratina, Chromolaena, Conoclinium, Eutrochium, Fleischmannia, and other genera). I have differed considerably from Cronquists treatments, as for instance in SE, regarding the rank at which to recognize taxonomic entities in Eupatorium. In the Southeastern United States, Eupatorium is a reticulately evolved complex, including diploids, triploids, and tetraploids; derivatives of hybridization produce sterile pollen but in some cases reproduce vigorously via agamospermous production of seeds. In some cases, these entities form separate populations from their presumed parental species, with distinctive ranges and habitats and more-or-less distinctive morphology. Cronquist treats morphologically highly distinctive entities, such as E. pinnatifidum, as full species, while stating that they are not long-persistent. He treats morphologically more subtle entities as varieties of one of the two presumed parental species, such as E. album var. vaseyi (very probably derived by hybridization of E. album var. album and E. sessilifolium). Other entities, difficult to distinguish morphologically from another species, he does not recognize, as for instance E. saltuense, included as a synonym under E. altissimum (E. saltuense may reflect hybridization between E. altissimum and some other species such as E. album, or possibly between E. hyssopifolium and E. album].
REFERENCE: Siripun & Schilling in FNA (2006c); Schilling (2011)=Y; Cronquist (1980)=SE; Godfrey (1949). The key adapted from those references. (also see Ageratina, Chromolaena, Conoclinium, Eutrochium, Fleischmannia)

HERBARIUM RESOURCES

SERNEC: Find Eupatorium rotundifolium in Southeast Regional Network of Experts and Collections (if available)
UNC SERNEC: Find Eupatorium rotundifolium in University of North Carolina Chapel Hill Herbarium - Southeast Regional Network of Experts and Collections (if available)

WEB RESOURCES

USDA: Find Eupatorium rotundifolium in USDA Plants
NPIN: Find Eupatorium rotundifolium in NPIN Database
FNA: Find Eupatorium rotundifolium in the Flora of North America (if available)
Google: Search Google for Eupatorium rotundifolium

NCBG IMAGE RECORDS

ID IMAGE1: 14436
ID IMAGE2: 0
ID IMAGE3: 8002

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19 photo(s) available in the Image Gallery

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