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Where it is native to, or its original habitat.
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From the origins of Europe, Asia and Africa the curly- leaf pondweed came over. It is unknown how and exactly when, but scientists think that it could've possibly been transported through fish stocking operations.
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DE, New Castle, Wilimngton. In the drainage BrandyWine- Christina. [USGS]
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Documented in NY, Niagra, Erie Country, Delaware Park Lake, in the drainage Niagra [USGS]
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Van Buren, Van Buren County,1910, South Eastern-Lake Michigan
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Ottawa, Pigeon Lake, Pine Creek Bay, Black Lake, Draingage in Black Macatawa.
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East of Kalamazoo, 1937 [USGS]
(Map of the watershed around Kalamazoo area) -
Grand Traverse Bay, 1946 [USGS]
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Kalkaska, Michigan and Livingston Michigan. Lake Huron and Boardman-Charlevoix