| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 229617 | MI | Kent | Lower Grand Watershed | 1972 | 04050006 | Lower Grand | established |
| 1322577 | MI | Ottawa | Grand River, Mill Point Park boat launch | 2016 | 04050006 | Lower Grand | established |
| 1457541 | MI | Kent | About 40 feet north of the Showboat Dock on North Jefferson in Lowell. | 1957 | 04050006 | Lower Grand | unknown |
| 1567659 | MI | Kent | [No locality description provided] | 2016 | 04050006 | Lower Grand | established |
| 1692003 | MI | Kent | Murray Lake | 2019 | 04050006 | Lower Grand | unknown |
| 1890371 | MI | Kent | [No locality description provided] | 2025 | 04050006 | Lower Grand | |
Citation for this information:
U.S. Geological Survey, 2025,
Iris pseudacorus: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 12/7/2025