Watermeal (Wolffia spp.)

This is a very tiny, free floating, rootless plant. It is light green in color. It can be mistaken for algae or duckweed. Usually it grows in quiet waters with no wave activity. Concern: Dense colonies can completely cover the surface and will cause dissolved oxygen depletions and fish kill. Did You Know We Have…

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Water Shield (Brasenia schreberi)

Oval leaves that float on the surface. The leaves are green on top and the underside is reddish-purple. Stems attach at the center of the leaves. There is a distinctive gelatinous slime on the underside of the leaves and coating the stem. Concern: Can form large colonies that interfere with boating and fishing activities. Did…

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Naiad (Najas spp.)

Forms very dense stands of rooted submerged vegetation. Leaves are dark green to greenish-purple, ribbon-like, opposite or in a whorl of three. The stems are very long and have many branches. Can often be confused with sago pondweed. Concern: If it becomes too dense it can reduce boat traffic and impede water flow in drainage…

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Sago Pondweed (Stuckenia pectinata)

A perennial plant that arises from thickly matted rhizomes and has no floating leaves. The stems are thin, long, and highly branching with leaves very thin and filament-like. It is generally completely submersed except the reproductive stalk that peaks above the water. Concern: Dense formations can limit movement of predator fish and inhibit fishing. Because…

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