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American Pondweed

Potamogeton nodosus

American pondweed can be found throughout the entire United States. It is sometimes considered a nuisance species and poses a threat to many native species of submerged aquatic vegetation. (ikb/Flickr)
American pondweed can be found throughout the entire United States. It is sometimes considered a nuisance species and poses a threat to many native species of submerged aquatic vegetation. (ikb/Flickr)

Also known as longleaf pondweed, American pondweed is a rooted, perennial herb that has both submerged and floating leaves.

Appearance:

The leaves of American pondweed are attached to a stem that can grow up to 6 feet long. Floating, oval-shaped leaves are 4 to 7 inches long and 1 to 2 inches wide, while the less abundant, submerged leaves are smaller and blade-like. Flowers emerge from the water in densely packed, club-like spikes. Seed heads are brownish red and extend above the water on slender stalks.

Habitat:

Lakes, ponds, ditches, streams and shallow water; can also grow in rapid and deep waters

Range:

Found throughout the United States

Predators:

American pondweed is often a food source for fish, waterfowl and turtles. Because it is considered a nuisance species, it is eradicated by humans with herbicide. It is also susceptible to aphid infestation.

Reproduction and Life Cycle:

Reproduction occurs through producing new shoots, fragmentation and seeds.

Other Facts:

  • Although native to the Bay region, American pondweed is considered a threat to other native submerged aquatic vegetation because of its tendency to form dense mats that block the sunlight these plants need to grow. However, these dense mats are considered a good source of shelter and food for fish, diving ducks and invertebrates.

Sources and Additional Information:




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