| Impact ID | 8620 |
| Impact Type | Genetic |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Hybridization between European water horehound (Lycopus europaeus) and L. americanus can occur when both species are living in close proximity. Hybrids have been found in North America; however, there are no records of hybrids in the Great Lakes. |
| Reference | 24928 |
| Cost | |
| Location | |