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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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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Widgeon Grass

Mat of widgeon grass floating at the surface of the water.

Widgeon grass has thin branched stems and sharp pointed leaves that are thread like. Flower spikes can emerge slightly and are brown to yellow.

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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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Quillworts

Small cluster of quillworts growing underwater.

Quillwort leaves are quill like and grow from one central stand in swampy areas. Leaves are arranged in a spiral.

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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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Brittle Naiad

Isolated brittle naiad on white background.

Brittle naiad has dark green leaves with serrated edges. Leaves grow two-tenths of an inch long. Flowers can grow to three-fourths of an inch.

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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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Small Pondweed

Small pondweed produces only submersed leaves that are light green and nearly three inches long and less than a quarter inch wide.

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Sago Pondweed

Sago Pondweed

Sago pondweed has many thread like submersed leaves that alternate and grow up to six inches long with a sharp point on the end.

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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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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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Hydrilla

Hydrilla

Hydrilla is a rooted submerged plant with whorled green leaves that have tiny teeth.

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