Image ID: 20938
Image by: Cressler, Alan M.
Image Collection: NCBG Digital Library
PLANT INDEX
ID_PLANT: EUCO7
SCIENTIFIC NAME: Eupatorium compositifolium
Include in WOTAS: 1
Publish to Web: 1
Last Modified: 2018-02-07
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:Erectperennial of sandy disturbed areas. STEMS: Stems 1-several from a somewhat woody crown, stout, branched above, hairy. LEAVES: Leaves opposite or alternate,crowded, 1--4 in. long, divided into grayish-green, hairy, narrow segments. INFLORESCENCE: FLOWERS: Flowers in many clusters of heads along branches; heads tiny, consisting of white disk florets (rays absent) with protruding styles. FRUITS: COMMENTS: HEIGHT: to 6 1/2 ft. DURATION:
Perennial
HABIT:
Herb
LEAF ARRANGEMENT:
Alternate LEAF COMPLEXITY: LEAF RETENTION: FLORAL CHARACTERISTICS
SYMMETRY:
Mixed
BLOOM TIME: Sep-Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
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: Disturbed, Sandhills
NATIVE RANGE: HORTICULTURAL
Plant Sale Text:
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 compositifolium
COMMON NAME: Coastal Dog-fennel, Yankeeweed
SYNONYMY: [= FNA, GW, K, RAB, S, SE, W, WH3]
PHENOLOGY: Sep-Dec.
HABITAT: Sandy disturbed areas; common.
COMMENTS: S. VA, KY, and OK south to s. FL and TX. This species, like E. capillifolium, is an excellent indicator of soil disturbance. At its northern limit, in se. VA, this species occurs on riverbanks, in the seasonally exposed drawdown zone (Fleming & Ludwig 1996).
RANGE MAP: Eupatorium compositifolium.png
Key to Map SymbolsABOUT 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 compositifolium in Southeast Regional Network of Experts and Collections (if available) UNC SERNEC: Find Eupatorium compositifolium in
University of North Carolina Chapel Hill Herbarium - Southeast Regional Network of Experts and Collections (if available)