| Impact ID | 7984 |
| Impact Type | Genetic |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | A few occurrences of hybridization between hairy willow herb (Epilobium hirsutum) and American willowherb (E. ciliatum), a native to the Great Lakes and other parts of North America, have been found in Europe, resulting in E. x novae-civitatis. |
| Reference | 25421 |
| Cost | |
| Location | |