| Impact ID | 8143 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | In a survey of fens in Ohio, Lycopus spp. constituted less than 2% of vegetation cover. |
| Reference | 25609 |
| Cost | |
| Location | Gallagher/Springfield Fen State Nature Preserve, Ohio, USA |