Reynoutria japonica
Reynoutria japonica
(Itadori knotweed)
Plants
Exotic
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Impacts

5 results for Reynoutria japonica (Itadori knotweed)
Download Data

Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1661774 CTNew HavenSouthbury2002 01100005 Housatonicunknown
1661779 NHCoosWentworth Location2002 01040001 Upper Androscoggin Riverunknown
1661780 NHSullivanSt. Gaudens National Historic Site2002 01080106 Black River-Connecticut Riverunknown
1669387 ORLaneWillamette Nat'l Forest, west slope Cascade Range; along State Hwy. 58, 4.2 miles NW of Oakridge.2002 17090001 Middle Fork Willametteunknown
1660223 PAMonroeTownship of Smithfield2002 02040104 Middle Delaware-Mongaup-Brodheadunknown

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.

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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. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [2/23/2026].

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