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Reynoutria japonica var. japonica

Family:Polygonaceae
Species:Reynoutria japonica Houtt. var. japonica
Common Name:Japanese knotweed
Habitat:Edges of streams, exposed gravel and sand bars in streams, floodplains, roadsides, and waste places. Often forming dense large monospecific stands. Widespread and often mixed with the hybrid Reynoutria ×bohemica
Associated Ecological Communities:**
Growth Habit:Herbaceous
Duration:Perennial
Category:Vascular
Plant Notes:Often confused with Reynoutria ×bohemica. Many records of R. japonica are actually R. ×bohemica.
Taxonomic Notes:**
Status:Not Native, Naturalized
References:**

** Not applicable or data not available.

Classification

SupraordinalEudicots
Order Caryophyllales
FamilyPolygonaceae
Genus Reynoutria
Species Reynoutria japonica Houtt. var. japonica - Japanese knotweed

Citation

Citation Reynoutria japonica Houtt. var. japonica
Basionym: **
Type: **

** Not applicable or data not available.

Source

CountyYearHerbariaNotesSubmission Info
Albany  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Allegany2007 BKL – BKL00087803
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Allegany2007 BKL – BKL00087801
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Allegany2007 BKL – BKL00087791
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Bronx1974 BKL – BKL00043139
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Bronx1994 BKL – BKL00043152
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Bronx1977 BKL – BKL00043140
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Bronx1976 BKL – BKL00043159
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Bronx1975 BKL – BKL00043161
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Bronx1900 CONN
Herbarium Name Used: Polygonum cuspidatum
   
Bronx1988 BKL – BKL00043162
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Bronx  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Broome  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Cattaraugus  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Cayuga2005 STERL
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Cayuga  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Cayuga2005 BKL – 00060529
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Chautauqua1990 NYS
Herbarium Name Used: Polygonum cuspidatum
   
Chautauqua  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Chemung  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Chenango2007 NYS
Herbarium Name Used: Fallopia japonica
  4/27/2007 - Connie Tedesco
Delaware  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Delaware2005 BKL – BKL00060662
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Dutchess  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Dutchess1995 BKL – BKL00007000
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Erie  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Essex2007 BKL – BKL00087774
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Franklin2006 SUCO
Herbarium Name Used: none Reynoutria japonica var. japonica
Town of Santa Clara  
Fulton2006 BKL – BKL00082495
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Fulton2007 NYS – 487
Herbarium Name Used: Fallopia japonica var. japonica
  12/22/2009 - Donna Vogler
Fulton2007 FMCC – 487
Herbarium Name Used: Fallopia japonica var. japonica
  12/22/2009 - Donna Vogler
Greene  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Jefferson1993 NYS
Herbarium Name Used: Polygonum cuspidatum
   
Kings1992 NYS
Herbarium Name Used: Polygonum cuspidatum
   
Kings1993 NYS
Herbarium Name Used: Polygonum cuspidatum
   
Kings  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Kings1893 BKL – BKL00043138
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Kings2008 BKL – BKL00091394
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Kings1990 BKL – BKL00043141
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Kings1992 BKL – BKL00043133
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Kings1993 BKL – BKL00043135
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Kings1988 BKL – BKL00043147
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Kings2001 BKL – BKL00016849
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Kings1989 BKL – BKL00043143
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Kings1990 BKL – BKL00043142
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Kings1988 BKL – BKL00043145
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Lewis2006 BKL – BKL00080028
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Livingston2006 BKL – BKL00074335
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Monroe1929 NCU – Accession #: 74016
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Monroe  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Nassau1938 OBPF – Log_num: 7606A
Herbarium Name Used: Polygonum cuspidatum
   
Nassau1989 BKL – BKL00043144
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Nassau1996 BKL – BKL00016006
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Nassau2008 BKL – BKL00090792
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
New York2003 BKL – BKL00025860
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
New York2004 BKL – BKL00033797
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
New York2003 BKL – BKL00024650
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
New York1996 BKL – BKL00043134
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
New York1996 BKL – BKL00043160
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
New York1890 BKL – BKL00043153
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
New York2003 BKL – BKL00025515
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Niagara  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Oneida  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Onondaga  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Ontario2006 BKL – BKL00082498
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Orange2004 BKL – BKL00033720
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Orange2009 BKL – BKL00095193
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Orange1990 BKL – BKL00017709
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Orange  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Orange1990 NYS
Herbarium Name Used: Polygonum cuspidatum
   
Orange2004 BH
Herbarium Name Used: Reynoutria japonica var. japonica
Werier (2017) voucher!; G. Moore et al. 6862 3/6/2018 - David Werier
Orange1997 BKL – BKL00005114
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Oswego2009 RCFS – accession # 13310
Herbarium Name Used: Fallopia japonica var. japonica
  11/17/2009 - RCFS (Andy Nelson)
Otsego2004 SUCO
Herbarium Name Used: none Reynoutria japonica var. japonica
Town of Hartwick  
Putnam  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Putnam1990 BKL – BKL00043137
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Queens1996 BKL – BKL00043150
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Queens2004 BKL – BKL00033812
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Queens2007 BKL – BKL00087337
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Queens1989 BKL – BKL00043136
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Queens1996 BKL – BKL00043149
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Queens1988 BKL – BKL00043146
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Queens2004 BKL – BKL00027285
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Queens  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Queens1989 NYS
Herbarium Name Used: Polygonum cuspidatum
   
Queens1996 BKL – BKL00043151
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Queens1996 BKL – BKL00043148
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Queens1980 BKL – BKL00043158
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Rensselaer1997 NYS
Herbarium Name Used: Polygonum cuspidatum
   
Rensselaer  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Richmond  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Richmond1989 BKL – BKL00043156
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Richmond2007 BKL – BKL00086985
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Richmond1919 BKL – BKL00043154
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Richmond1989 BKL – BKL00043157
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Rockland2004 BKL – BKL00066263
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Rockland  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Rockland1990 NYS
Herbarium Name Used: Polygonum cuspidatum
   
Schenectady  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Seneca  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
St. Lawrence1985 NYS
Herbarium Name Used: Polygonum cuspidatum
   
St. Lawrence1982 NYS
Herbarium Name Used: Polygonum cuspidatum
   
St. Lawrence1982 STLA
Herbarium Name Used: none Reynoutria japonica var. japonica
  Anne Johnson
Steuben  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Suffolk  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Suffolk1996 QUE
Herbarium Name Used: Polygonum cuspidatum
   
Suffolk1973 OBPF – Log_num: 9888
Herbarium Name Used: Polygonum cuspidatum
   
Suffolk2010 BKL – BKL00098194
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Suffolk2011 BKL – BKL00102555
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Suffolk2009 BKL – BKL00095559
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Suffolk2006 BKL – BKL00076220
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Suffolk2000 BKL – BKL00011931
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Tompkins2005 BKL – BKL00060488
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Ulster  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Ulster1990 BKL – BKL00045248
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)
Warren  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Washington  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Westchester  NYFA_1990
Herbarium Name Used: none Reynoutria japonica var. japonica
   
Westchester2006 BKL – BKL00074336
Herbarium Name Used: Fallopia japonica
  2/8/2012 - BKL (Steve Glenn)

Synonyms

SynonymFull CitationBasionymTypeNotes
Fallopia japonica Fallopia japonica (Hout.) Ronse Decr.   
Polygonum cuspidatum Polygonum cuspidatum Siebold & Zucc.   
Polygonum zuccarinii Polygonum zuccarinii Small