Reynoutria japonica
(Itadori knotweed)
Plants
Exotic
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Impacts

9 results for Reynoutria japonica (Itadori knotweed)
Download Data

Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1713071 OHCuyahogaJohn Nagy Wetland2022 04110002 Cuyahoga 
1713070 OHCuyahogaWCS BC to res edge2022 04110002 Cuyahoga 
1713069 OHLakeButtermilk falls creek2022 04110003 Ashtabula-Chagrin 
1730549 ORLane[No locality description provided]2022 17100206 Siuslaw 
1730595 ORLane[No locality description provided]2022 17100206 Siuslaw 
1710373 ORLaneIndian Creek between NF-32 and Mapleton-Junction City Hwy2022 17100206 Siuslaw 
1710374 ORLaneIndian Creek between NF-32 and Mapleton-Junction City Hwy2022 17100206 Siuslaw 
1695458 PAWaynethe entire riverbank of the west branch and main stem of the Delaware River2022 02040101 Upper Delawareestablished
1697473 WIWausharaCypress Road, Neshkoro, WI2022 04030201 Upper Fox 

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.

Disclaimer:

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 [1/13/2026].

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