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Long-stemmed submerged perennial with non-toothed leaves (to the naked eye) in whorls of 4-6 and small, white, 3-petalled emergent flowers. Can top out and form mats on the surface. Blooms in summer. Found in slow moving water up to 30 feet deep.
|Soil and Moisture Conditions
|Found in side channels and on the banks of the Willamette River.
|Clean fragments from boats, motors, and trailers to prevent spread. Small areas can be cleared by hand-pulling.
|Remove all plant fragments from the water.
|Reproduction and Spread
|Spreads rapidly by fragmentation.
|Native to South America, introduced to US in 1893.
|Elodea canadensis, Elodea nuttallii, Hydrilla
|Clogs Waterways, impedes recreation, outcompetes native species, reduces fish habitat and alters water quality.