Curly Pondweed (Potamogeton crispus)
Where did it come from?
- Originates from Europe, Africa, and Australia.
Where can it be found in South Dakota?
- Found in several water bodies across the state, including Sheridan Lake, Canyon Lake, Rapid Creek, Angostura
Reservoir and Lakes Oahe, Sharpe, and Lewis and Clark.
What does it look like?
- They have flat stems with some branching that are 1-3 inches long and about 1/8 inch in diameter. Long narrow leaves are attached to the stem, and it produces brown flowers between May and October.
Why is Curly Pondweed a problem?
- Can form dense mats at the water surface, shading out native vegetation and creating problems for boaters, especially in protected areas (marinas).
How is Curly Pondweed spread?
- Curly pondweed spreads by hardened buds (sometimes called turions) and by seeds.
Check out
Aquatic Nuisance Species Prevention on ways to prevent
the spread of Aquatic Nuisance Species
Curlyleaf Pondweed links
USGS Fact Sheet on Curly
Pondweed
USACE Fact sheet on Curly
Pondweed and Distribution Map
Pictures of Curly Pondweed
South Dakota Curly Pondweed Distribution
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Pondweed
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Related Links
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SD ANS Watch List "The Terrible Ten"
SD Noxious Weed List
SD Invasive Species Laws and
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SD Infested Waters List
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