- 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
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|Diver hand pulling/dredging, aquatic herbicide and installation of bottom barriers. Contact your County Weed District or local Applicator for more information.
|Lakes, rivers and sloughs.
|Slender, fragile and extensive root system.
|Thread-like with four leaflets arranged around the stem.
|Perennial; two years or longer.
|Priority 2A Weed
|Common in isolated areas of Montana.
|Similar Looking Plants
|Northern native milfoil and parrotfeather.
|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.