| Impact ID | 7917 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Cirsium palustre poses a threat to C. pitcheri (Torr. ex Eaton) Torr. & A. Gray, which is native to the Great Lakes region and is classified as threatened by the federal government and the province of Ontario. |
| Reference | 25238 |
| Cost | |
| Location | Ontario, Canada |