Leafy Pondweed

Isolated close up of leafy pondweed on white background.

Leafy pondweed has thread like branching stems. Submersed leaves are green to bronze, thin, and linear. Brown flowers grow in clusters.

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Horned Pondweed

Horned pondweed floating in a cluster at the surface of the water.

Horned pondweed roots, stems, and leaves are all long and thread like. It has tiny single flowers in May or June. The seeds are horn shaped.

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Waterthread Pondweed

Isolated close up of waterthread pondweed on white background.

Waterthread pondweed’s stems are thread like. Submersed leaves are thin and straight. Floating leaves are leathery with a rounded base.

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Variable Leaf Pondweed

Close up of variable leaf pondweed floating on water.

Variable leaf pondweed’s submersed pointy leaves grow more than five inches long. Floating leaves can be almost three inches long with longer leaf stalks.

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Ribbonleaf Pondweed

Close up of ribbonleaf pondweed from above.

Ribbonleaf pondweed’s submersed leaves are floppy and bright green to reddish. They grow two to 10 inches long and nearly a half inch wide.

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Variable Leaf Watermilfoil

Variable leaf watermilfoil in an aquarium.

Variable leaf watermilfoil has thick reddish stems and can have submersed and emersed leaves that are feathery, limp, and deeply divided.

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Indian Swampweed

Indian swampweed underwater.

Indian swampweed has compound leaves with opposite leaflets that can be emersed or submersed and are broader at the tip. This plant is uncommon.

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Duck Lettuce

Duck lettuce floating in water with leaves and two flowers.

Young duck lettuce leaves are linear and become oblong, oval, or heart shaped as they mature. Some flowers stand above the surface with white petals.

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Flowering Rush

Flowering rush flowers, some buds, some open, some spent on a single plant.

Flowering rush can be submersed or emersed and has round stems that can grow up to four feet tall. Clusters of pink flowers grow on a single stalk.

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Floating Leaf Pondweed

Floating leaf pondweed has long, narrow, stiff submersed leaves and two to four inch long floating leaves on long stalks.

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Robbin’s Pondweed

Robbins Pondweed

Robbin’s pondweed has thick and coarse submersed leaves with a prominent yellow vein in the middle.

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White Stem Pondweed

Whitestem Pondweed

White stem pondweed has a zig zag stem that is sparingly branched. Alternately arranged wavy green leaves have a yellow midvein and no floating leaves.

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Illinois Pondweed

Illinois Pondweed

Illinois Pondweed has lance shaped submerged leaves eight inches long that come to a point at the end.

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