Eurasian Watermilfoil (Myriophyllum Spicatum)
2A, common in isolated areas of Montana
Quick ID
- Feathery underwater foliage
- 12 or more pairs of leaflets
- Leaves collapse around the stem when removed from the water
- Mature leaves in whorls of four around the stem
- Length up to 15 feet
Eurasian Watermilfoil
Video Information
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Weed Images
Weed Specifications
| Type | Information |
|---|---|
| Toxicity | Non-toxic |
| Best Management Practices | Besides prevention, early detection and rapid response are the most important management actions. |
| Habitat | Lakes, rivers and sloughs. |
| Root | Slender, fragile and extensive root system. |
| Leaves | Thread-like with four leaflets arranged around the stem. |
| Lifespan | Perennial |
| Similar Looking Plants | Northern native milfoil and parrotfeather. |
| Important Information | Forms very dense mats of vegetation on the surface of the water; extremely rapid reproduction and can infest an entire lake within two years of introduction to the system. A plant fragment with 2 nodes (areas where leaves are located) can start a new infestation. |
