Photo courtesy of J. Madsen
| Scientific Name | Myriophyllum spicatum L. |
| Common Name | Eurasian watermilfoil |
| Family | Haloragaceae (Watermilfoil) |
| Class | Dicot |
| Description | Mostly evergreen perennial; overwinters by root crown, aerial wind -pollinated flowers, spread by runners and autofragments |
| US Distribution | Essentially all lower 48 states, except southern Florida |
| Worldwide Distribution | Temperate portion of northern hemisphere, nuisance predominantly in North America (US and southern Canada); native to Armenia |
| Ecology | Rooted submersed in 1 to 15 ft. depth |
| Economic Importance | Major nuisance aquatic plant in US, southern Canada ($5M/yr in central New York) |
| Ecological Importance | Major impact on US aquatic systems |
| Notes | Tolerates moderate salinity, grows in lower estuary areas |