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American Pondweed

Potamogenton nodosus

American pondweed can be found throughout the entire United States. It is considered invasive 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 considered invasive 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. It is considered a threat to 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.

Appearance:

  • Leaves 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:

  • Prefers to grow in lakes, ponds, ditches, streams and shallow water but can also grow in rapid and deep waters

Range:

  • American pondweed can be found throughout the entire United States

Predators:

  • Often a food source for fish, waterfowl and turtles
  • Considered an invasive species, eradicated by humans with herbicide
  • Susceptible to aphid infestation

Reproduction and Life Cycle:

  • Reproduction occurs through producing new shoots, fragmentation and seeds

Sources and Additional Information:




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