Reynoutria japonica

ClassificationDicots
FamilyPolygonaceae
Family (Traditional)Polygonaceae
GenusReynoutria
SpeciesReynoutria japonica Houtt.
Common NameJapanese knotweed, Japanischer Schlingknöterich
Growth Habitforb
Plant NotesTN-IPPC Rank: Established Threat
Habit: forb; Woody/Herbaceous: herbaceous; Terrestrial/Aquatic: Terrestrial;
Leaf Arrangement: Alternate; Simple/Compound: Simple;
Fruit Color: ;
*Average C-Value: 0.0
C value N/A
StatusNot Native; AGCP (UPL), EMP (FACU) (NWPL)
Specimen(s) View and Download Specimen Details »

** Not applicable or data not available.

Species Distribution Map

This species has been reported in the counties highlighted in the interactive distribution map below. Click on a county to display the its name. Click the question mark icon () to view additional information about the ecoregions shown. In the map legend, there are links to toggle the visibility of the ecoregions and/or their labels. In addition, clicking on an ecoregion name will highlight that region on the map.

  • State Boundaries
  • Counties
  • Counties - Species Present
Ecoregions
  • Southeastern Plains
    • Blackland Prarie
  • Blue Ridge Mountains
  • Ridge and Valley
  • Cumberland Plateau
  • Cumberland Mountains
  • Allegheny Plateau
  • Interior Plateau
    • Bluegrass Region
    • Nashville Basin
    • Pennyroyal Karst Plain
    • Western Highland Rim
    • Eastern Highland Rim

Synonyms

SynonymFull Citation
Polygonum cuspidatum Polygonum cuspidatum Siebold & Zucc.
Polygonum japonicum Polygonum japonicum Meisn.

Specimens and Distribution

This species has been reported in the following counties by the herbaria listed. An overview of the individual specimens are provided in the table that follows. Click on the accession number to view details; click on column headers to sort.

Counties included on distribution map: Barren (KY), Bath (KY), Bell (KY), Boone (KY), Bracken (KY), Breckinridge (KY), Caldwell (KY), Calloway (KY), Campbell (KY), Clay (KY), Estill (KY), Fayette (KY), Franklin (KY), Garrard (KY), Greenup (KY), Harlan (KY), Knott (KY), Knox (KY), Laurel (KY), Lee (KY), Leslie (KY), Letcher (KY), Lewis (KY), Lyon (KY), Madison (KY), Marion (KY), Menifee (KY), Mercer (KY), Montgomery (KY), Owen (KY), Perry (KY), Pike (KY), Powell (KY), Pulaski (KY), Rockcastle (KY), Rowan (KY), Woodford (KY), Bradley (TN), Campbell (TN), Carroll (TN), Cocke (TN), Cumberland (TN), Davidson (TN), Dickson (TN), Fentress (TN), Giles (TN), Hamilton (TN), Hawkins (TN), Knox (TN), Maury (TN), Montgomery (TN), Polk (TN), Rutherford (TN), Scott (TN), Sevier (TN), Shelby (TN), Stewart (TN), Sullivan (TN), Unicoi (TN), Washington (TN)

Herbaria represented by specimen data listed below: APSC, BEREA, EKY, ETSU, HTTU, KNK, TENN, UCHT

Range of years during which specimens were collected: 1955 - 2014

Accession No. (click for full details) County State Coll. Date Collector &
Collection No.
Herbarium &
Herbarium Name Used
31234100576972 Pike Kentucky 22 Jul 1964 Elizabeth M. Browne
8949
EKY
Polygonum cuspidatum
31234100576956 Perry Kentucky 19 May 1962 Elizabeth M. Browne
5310
EKY
Polygonum cuspidatum
31234100576832 Garrard Kentucky 01 Oct 1955 Mary E. Wharton
9597
EKY
Polygonum cuspidatum
31234100577004 Powell Kentucky 19 Sep 2013 Matthew Catron
EKY
Polygonum cuspidatum
N/A Menifee Kentucky 20 Aug 1991 Ross C. Clark
22587
EKY
Reynoutria japonica
31234100576758 Barren Kentucky 27 Apr 1979 George P. Johnson
582
EKY
Polygonum cuspidatum
31234100576998 Pike Kentucky 12 Aug 1964 Elizabeth M. Browne
9159.3
EKY
Polygonum cuspidatum
31234100576816 Fayette Kentucky 16 Sep 1960 Elizabeth M. Browne
2599
EKY
Polygonum cuspidatum
31234100577079 Knox Tennessee 08 Jun 1980 Brian Boom
534
EKY
Polygonum cuspidatum
31234100576899 Madison Kentucky 26 Aug 1997 Ronald L. Jones
8222
EKY
Polygonum cuspidatum
31234100748951 Cumberland Tennessee Apr 2006 Dwayne Estes
08743
EKY
Polygonum cuspidatum
31234100748977 Madison Kentucky 15 Apr 1993 Gary W. Libby
OB-219
EKY
Polygonum cuspidatum
31234100576923 Owen Kentucky 02 Jun 1996 Timothy J. Weckman
2779
EKY
Polygonum cuspidatum
31234100576782 Calloway Kentucky 14 Oct 1985 Raymond Athey
5131
EKY
Polygonum cuspidatum
31234100576824 Franklin Kentucky 09 Aug 1956 Mary E. Wharton
10500
EKY
Polygonum cuspidatum
31234100577061 Davidson Tennessee 15 Aug 1978 Ronald L. Jones
2201
EKY
Polygonum cuspidatum
31234100576964 Pike Kentucky 03 Aug 2008 Julie B. Clark
413
EKY
Polygonum cuspidatum
31234100776143 Menifee Kentucky 20 Aug 1991 Ross C. Clark
22587
EKY
Reynoutria japonica
31234100576774 Boone Kentucky 09 Aug 1991 Landon E. McKinney
4841
EKY
Polygonum cuspidatum
31234100576857 Knott Kentucky 21 Jun 2001 Timothy J. Weckman
6551
EKY
Polygonum cuspidatum
31234100576915 Mercer Kentucky 01 Sep 1997 Timothy J. Weckman
3798
EKY
Polygonum cuspidatum
31234100576840 Harlan Kentucky 19 May 1962 Elizabeth M. Browne
5324
EKY
Polygonum cuspidatum
31234100576881 Leslie Kentucky 04 Jul 1991 Tim Hacker
10
EKY
Polygonum cuspidatum
31234100576980 Pike Kentucky 19 Jun 2008 Julie B. Clark
242
EKY
Polygonum cuspidatum
N/A Clay Kentucky 30 May 1996 Timothy J. Weckman
2729
EKY
Polygonum cuspidatum
31234100577012 Woodford Kentucky 02 May 1964 Elizabeth M. Browne
8285
EKY
Polygonum cuspidatum
31234100724424 Garrard Kentucky 22 Aug 2010 W.W. Overbeck
718
EKY
Polygonum cuspidatum
31234100576865 Knox Kentucky 21 Jul 1982 Ronald L. Jones
3831
EKY
Polygonum cuspidatum
31234100576766 Bath Kentucky 26 Jun 1984 Julian Campbell
393
EKY
Polygonum cuspidatum
31234100721073 Garrard Kentucky 01 Jun 2010 W. W. Overbeck
499
EKY
Polygonum cuspidatum
N/A Perry Kentucky 09 Jun 1986 Earlis Thornsberry
57
EKY
Polygonum cuspidatum
31234100576741 Barren Kentucky 14 Sep 1991 Ronald L. Jones
6968
EKY
Polygonum cuspidatum
31234100748969 Lee Kentucky 27 Apr 1996 Danny Husband
19
EKY
Polygonum cuspidatum
N/A Menifee Kentucky 20 Aug 1991 Ross C. Clark
22587
EKY
Reynoutria japonica
BEREA018947 Lewis Kentucky
BEREA
Reynoutria japonica
BEREA018944 Campbell Kentucky
BEREA
Reynoutria japonica
BEREA024065 Pulaski Kentucky
BEREA
Reynoutria japonica
BEREA018943 Bell Kentucky
BEREA
Reynoutria japonica
BEREA018948 Lewis Kentucky
BEREA
Reynoutria japonica
BEREA018945 Laurel Kentucky
BEREA
Reynoutria japonica
31234100576808 Estill Kentucky 09 Oct 1987 Richard G. Guetig
520
EKY
Polygonum cuspidatum
31234100576907 Marion Kentucky 03 May 1999 Timothy J. Weckman
4834
EKY
Polygonum cuspidatum
31234100576949 Perry Kentucky 21 Jun 2001 Timothy J. Weckman
6455
EKY
Polygonum cuspidatum
31234100576873 Knox Kentucky 15 May 1993 Judith E. Rozeman
250
EKY
Polygonum cuspidatum
BEREA018946 Lewis Kentucky
BEREA
Reynoutria japonica
BEREA018950 Madison Kentucky
BEREA
Reynoutria japonica
BEREA018953 Rockcastle Kentucky
BEREA
Reynoutria japonica
BEREA018952 Madison Kentucky
BEREA
Reynoutria japonica
BEREA018951 Madison Kentucky
BEREA
Reynoutria japonica
ETSU005287 Unicoi Tennessee 01 Oct 2011 Frosty Levy
ETSU
Polygonum cuspidatum
N/A Unicoi Tennessee 03 Apr 2010 Frosty Levy
ETSU
Polygonum cuspidatum
31973000015221 Greenup Kentucky
KNK
Polygonum cuspidatum
31973000015228 Campbell Kentucky
KNK
Polygonum cuspidatum
31973000015222 Rowan Kentucky
KNK
Polygonum cuspidatum
BEREA018949 Lewis Kentucky
BEREA
Reynoutria japonica
31973000015224 Lewis Kentucky
KNK
Polygonum cuspidatum
31973000015225 Campbell Kentucky
KNK
Polygonum cuspidatum
31973000015227 Campbell Kentucky
KNK
Polygonum cuspidatum
31973000015226 Bracken Kentucky
KNK
Polygonum cuspidatum
31973000005192 Campbell Kentucky 07 Jun 2014 Conley, Justin
2014-0021
KNK
Polygonum cuspidatum
TENN-V-0088563 Harlan Kentucky
TENN
Polygonum cuspidatum
TENN-V-0088565 Pike Kentucky
TENN
Polygonum cuspidatum
TENN-V-0088562 Fayette Kentucky
TENN
Polygonum cuspidatum
TENN-V-0087574 Sevier Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087575 Sevier Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087566 Knox Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087570 Rutherford Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087560 Davidson Tennessee
TENN
Polygonum cuspidatum
31973000015220 Perry Kentucky
KNK
Polygonum cuspidatum
31973000015219 Campbell Kentucky
KNK
Polygonum cuspidatum
TENN-V-0087557 Cocke Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087573 Scott Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087567 Maury Tennessee
TENN
Polygonum cuspidatum
TENN-V-0088561 Bell Kentucky
TENN
Polygonum cuspidatum
TENN-V-0087569 Polk Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087579 Washington Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087555 Carroll Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087572 Scott Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087571 Rutherford Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087577 Stewart Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087578 Sullivan Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087562 Fentress Tennessee
TENN
Polygonum cuspidatum
TENN-V-0088560 Bell Kentucky
TENN
Polygonum cuspidatum
TENN-V-0087563 Giles Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087558 Cumberland Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087564 Hamilton Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087559 Cumberland Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087568 Montgomery Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087561 Dickson Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087556 Campbell Tennessee
TENN
Polygonum cuspidatum
TENN-V-0088564 Perry Kentucky
TENN
Polygonum cuspidatum
UCHT010795 Polk Tennessee
UCHT
Polygonum cuspidatum
UCHT010794 Hamilton Tennessee
UCHT
Polygonum cuspidatum
APSC0007542 Dickson Tennessee
APSC
Reynoutria japonica
APSC0030005 Polk Tennessee
APSC
Reynoutria japonica
APSC0118511 Barren Kentucky
APSC
Reynoutria japonica
APSC0013043 Montgomery Tennessee
APSC
Reynoutria japonica
TENN-V-0087576 Shelby Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087554 Carroll Tennessee
TENN
Polygonum cuspidatum
TENN-V-0087565 Hawkins Tennessee
TENN
Polygonum cuspidatum
UCHT010797 Polk Tennessee
UCHT
Polygonum cuspidatum
UCHT010796 Hamilton Tennessee
UCHT
Polygonum cuspidatum
APSC0007545 Cumberland Tennessee
APSC
Reynoutria japonica
APSC0115023 Rowan Kentucky
APSC
Reynoutria japonica
APSC0069933 Montgomery Kentucky
APSC
Reynoutria japonica
APSC0074938 Rowan Kentucky
APSC
Reynoutria japonica
APSC0075289 Letcher Kentucky
APSC
Reynoutria japonica
APSC0030004 Polk Tennessee
APSC
Reynoutria japonica
APSC0007539 Stewart Tennessee
APSC
Reynoutria japonica
APSC0118542 Campbell Kentucky
APSC
Reynoutria japonica
APSC0118513 Caldwell Kentucky
APSC
Reynoutria japonica
APSC0069932 Montgomery Kentucky
APSC
Reynoutria japonica
APSC0052846 Hamilton Tennessee
APSC
Reynoutria japonica
APSC0007546 Cumberland Tennessee
APSC
Reynoutria japonica
APSC0073610 Greenup Kentucky 07 Aug 1982 Max Medley
APSC
Reynoutria japonica
APSC0010994 Polk Tennessee
APSC
Reynoutria japonica
APSC0115021 Rowan Kentucky
APSC
Reynoutria japonica
APSC0007541 Montgomery Tennessee
APSC
Reynoutria japonica
APSC0007544 Montgomery Tennessee
APSC
Reynoutria japonica
APSC0007538 Lyon Kentucky 20 Jul 1987 Edward Chester
APSC
Reynoutria japonica
APSC0077781 Rowan Kentucky
APSC
Reynoutria japonica
APSC0007543 Stewart Tennessee
APSC
Reynoutria japonica
HTTU019303 Fentress Tennessee
HTTU
Polygonum cuspidatum
HTTU019308 Fentress Tennessee
HTTU
Polygonum cuspidatum
HTTU019304 Scott Tennessee
HTTU
Polygonum cuspidatum
HTTU019306 Fentress Tennessee
HTTU
Polygonum cuspidatum
APSC0077780 Breckinridge Kentucky
APSC
Reynoutria japonica
HTTU019307 Fentress Tennessee
HTTU
Polygonum cuspidatum
HTTU019305 Fentress Tennessee
HTTU
Polygonum cuspidatum
UCHT037005 Polk Tennessee
UCHT
Reynoutria japonica
UCHT030830 Bradley Tennessee
UCHT
Polygonum cuspidatum
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Plant Photos

Reynoutria japonica - Joey Shaw
Reynoutria japonica - Joey Shaw
Reynoutria japonica - Joey Shaw
Reynoutria japonica - Joey Shaw
Reynoutria japonica - Milo Pyne
Reynoutria japonica - Milo Pyne
Reynoutria japonica - Milo Pyne
Reynoutria japonica - Milo Pyne
Reynoutria japonica - Tara Littlefield
Reynoutria japonica - Tara Littlefield
Reynoutria japonica - Joey Shaw
Reynoutria japonica - Joey Shaw