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Curly-leaf pondweed (Discovered in Gull Chain many years ago)
(Dreissena polymorpha)
From the Minnesota DNR website:
Common names: Curly cabbage, crisp pondweed.
Location: Grows from the shore to depths of up to 15 feet.
Description: Leaves are somewhat stiff and crinkled, approximately
1/2-inch wide and 2 to 3 inches long; leaves are arranged alternately
around the stem, and become more dense toward the end of branches;
produces winter buds can be confused with claspingleaf pondweed.
More information:
Map of Curly-leaf pondweed infestation in Minnesota
MISIN curly-leaf pondweed identification training module
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