Sunday 19 May
Spotted pondweed (Potamogeton pulcher)
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Spotted pondweed fact file
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Spotted pondweed description
A distinctive aquatic plant, the spotted pondweed (Potamogeton pulcher) is, as its common name suggests, characterised by many conspicuous spots, which are scattered on the stems and on some of the leaves (2) (3). This species has both submerged leaves, which remain below the water, and floating leaves, which mass together on the surface (4).
The submerged leaves of the spotted pondweed are usually arranged alternately along the stem, and are narrow and lance-shaped, with wavy margins. These leaves are typically dark green, with a pair of smaller light to dark brown leaves, called stipules, at the base (2) (3) (5) (6). In comparison, the floating leaves of the spotted pondweed are usually light to dark green, oval-shaped and slightly indented at the base, with long black- or purple-spotted leaf stalks (2) (3) (5) (6) (7).
The inflorescences of the spotted pondweed are produced in dense spikes above the water, and each contains many small, inconspicuous flowers. The individual flowers have four small, greenish petals (2) (6) (7). The fruit of this species is olive to dark green or brown, rounded or oval-shaped, and has three prominent ridges on the outer surface (3) (4) (6) (8).Top
Spotted pondweed biologyTop
Spotted pondweed rangeTop
Spotted pondweed habitatTop
Spotted pondweed status
The spotted pondweed has not yet been assessed by the IUCN.Top
Spotted pondweed threats
Agricultural run-off and flooding may also affect this species (7).Top
Spotted pondweed conservation
There are currently no specific conservation measures in place for the spotted pondweed. Recommended conservation actions for this species include protecting its wetland habitat, maintaining water quality and removing invasive species (2) (5).
Creating buffers to protect the spotted pondweed from run-off and flooding may also benefit this species’ populations (7).Top
Find out more
Find out more about the spotted pondweed:
Flora of North America - Spotted pondweed:
Pennsylvania Natural Heritage Program - Spotted pondweed:
This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
- The reproductive shoot of a plant, which bears a group or cluster of flowers.
UNEP-WCMC (July, 2011)
Maine Natural Areas Program - Spotted pondweed (Potamogeton pulcher) (July, 2011)
Flora of North America - Spotted pondweed (Potamogeton pulcher) (July, 2011)
- Britton, N.L. and Brown, A. (1913) An Illustrated Flora of the Northern United States, Canada and the British Possessions - from Newfoundland to the Parallel of the Southern Boundary of Virginia, and from the Atlantic Ocean westward to the 102D Meridian. Volume 1. Charles Scribner’s Sons, New York.
Michigan Natural Features Inventory - Spotted pondweed (Potamogeton pulcher) (July, 2011)
Robert W. Freckmann Herbarium, University of Wisconsin - Spotted pondweed (Potamogeton pulcher) (July, 2011)
Pennsylvania Natural Heritage Program - Spotted pondweed (Potamogeton pulcher) (July, 2011)
- Mohlenbrock, R.H. (2006) Flowering Plants: Flowering Rush to Rushes (Illustrated Flora of Illinois). Southern Illinois University Press, Illinois.
Wisconsin Department of Natural Resources - Spotted pondweed (Potamogeton pulcher) (July, 2011)
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