Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
246175
| OR | Columbia | Sauvie Island, along land joining Oak and Sauvie Islands, in a branch of the Gilbert River | 1981 |
17090012
| Lower Willamette | collected |
242683
| OR | Multnomah | Columbia Slough, Portland | 2003 |
17090012
| Lower Willamette | established |
859082
| OR | Multnomah | Sauvie Island | 1981 |
17090012
| Lower Willamette | established |
859051
| OR | Multnomah | Sauvie Island | 1981 |
17090012
| Lower Willamette | established |
1468155
| OR | Multnomah | Smith and Bybee Wetlands Natural Area | 2018 |
17090012
| Lower Willamette | established |