.
| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 252205 | IN | Porter | Porter County | 2008 | 04040001 | Little Calumet-Galien | collected |
| 1256686 | IN | Lake | Lake County | 1909 | 04040001 | Little Calumet-Galien | established |
| 1655830 | IN | Lake | Indiana, Lake, Miller | 1896 | 04040001 | Little Calumet-Galien | established |
| 252208 | IN | LaGrange | LaGrange County | 2008 | 04050001 | St. Joseph | collected |
| 252209 | IN | Steuben | Steuben County | 2008 | 04050001 | St. Joseph | collected |
| 252210 | IN | Noble | Noble County | 2008 | 04050001 | St. Joseph | collected |
| 252206 | IN | St. Joseph | St. Joseph County | 2008 | 04050001 | St. Joseph | collected |
| 252207 | IN | Elkhart | Elkhart County | 2008 | 04050001 | St. Joseph | collected |
| 252211 | IN | DeKalb | DeKalb County | 2008 | 04100003 | St. Joseph | collected |
| 252215 | IN | Adams | Adams County | 2008 | 04100004 | St. Marys | collected |
Citation for this information:
U.S. Geological Survey, 2024,
Rumex obtusifolius: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 4/23/2024