| Impact ID | 8055 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | By 1970, Iris pseudacorus (yellow iris) was found growing to the complete exclusion of Typha and other native marsh plants along the Merced River in California. |
| Reference | 10753 |
| Cost | |
| Location | western North America |