Reynoutria japonica
(Itadori knotweed)

49 results for Reynoutria japonica (Itadori knotweed)
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Click here for listing in all states

Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1661052 CTFairfieldBridgeport1894 01100006 Saugatuckunknown
1661053 CTFairfieldBridgeport1901 01100006 Saugatuckunknown
1661055 CTFairfieldBridgeport1939 01100006 Saugatuckunknown
1661054 CTFairfieldBridgeport1944 01100006 Saugatuckunknown
1661056 CTFairfieldFairfield1931 01100006 Saugatuckunknown
1658722 CTFairfieldFairfield1931 01100006 Saugatuckunknown
1661800 CTFairfieldFairfield1997 01100006 Saugatuckunknown
1660076 CTHartfordBigelow Brook, Manchester2004 01080205 Outlet Connecticut Riverunknown
1660070 CTHartfordBristol1973 01080207 Farmington Riverunknown
1659864 CTHartfordBristol1973 01080207 Farmington Riverunknown
1659891 CTHartfordEast Hartford1922 01080205 Outlet Connecticut Riverunknown
1658724 CTHartfordEnfield1999 01080205 Outlet Connecticut Riverunknown
1661526 CTHartfordHartford2009 01080205 Outlet Connecticut Riverunknown
1660216 CTHartfordHockanum River2005 01080205 Outlet Connecticut Riverunknown
1660071 CTHartfordHockanum River Hiking Trail, Kohl's Section2003 01080205 Outlet Connecticut Riverunknown
1660101 CTHartfordLaurel Marsh Hiking Trail, Manchester2004 01080205 Outlet Connecticut Riverunknown
1659892 CTHartfordManchester1936 01080205 Outlet Connecticut Riverunknown
1660271 CTHartfordNorthwest Park1998 01080207 Farmington Riverunknown
1660072 CTHartfordSalters Pond2003 01080205 Outlet Connecticut Riverunknown
1659893 CTHartfordScantic River, South Windsor1989 01080205 Outlet Connecticut Riverunknown
1659894 CTHartfordWest Hartford1932 01080205 Outlet Connecticut Riverunknown
1659595 CTLitchfieldLitchfield2013 01100005 Housatonicunknown
1660246 CTLitchfieldNew Milford2001 01100005 Housatonicunknown
1659895 CTLitchfieldNewfield1973 01100005 Housatonicunknown
1660005 CTLitchfieldRoxbury Station1999 01100005 Housatonicunknown

Data Disclaimer: Number of records does not imply species abundance. This summary represent collection records only and may not reflect the actual distribution of established populations. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data.


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [6/13/2024].

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For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.