curlyleaf pondweed

Najadales > Potamogetonaceae > Potamogeton crispus L.
Synonym(s): curly-leaved pondweed, curly pondweed

Curlyleaf pondweed is a perennial, submerged, aquatic herb that is native to Eurasia. Leaves are sessile, oblong, stiff, 1.6-3.9 in. (4-10 cm) long, 0.2-0.4 in. (5-10 mm) wide, translucent and have noticeably curly margins (resemble lasagna noodles). Flowering occurs in the summer to early fall, when emergent flowers develop. Flowers are brown, inconspicuous and wind pollinated. Fruits are flat with a pointed beak and are 0.2 in. (4-6 mm) long. In the midsummer plants form turions (vegetative buds), from which new growth starts in fall or winter. Curlyleaf pondweed tolerates fresh or slightly brackish water and can grow in shallow, deep, still or flowing water. Plants can grow in clear or turbid water, but are mostly shade intolerant. Plants were introduced to the United States, possibly as a hitchhiker on boats, in the mid-1800s.


Identification, Biology, Control and Management Resources


Selected Images from Invasive.org

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Feature(s); Turion
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
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Plant(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
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Foliage;
Chris Evans, River to River CWMA, Bugwood.org
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Infestation;
Chris Evans, River to River CWMA, Bugwood.org
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Diagram or Graphic; Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 81.
USDA PLANTS Database, USDA NRCS PLANTS Database, Bugwood.org
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Diagram or Graphic; USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service.
USDA PLANTS Database, USDA NRCS PLANTS Database, Bugwood.org
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Invasive Reference(s):

Check Invasive.org for most current lists.
  • Alabama - Noxious Weed Law
  • Georgia - EPPC list
  • Maine - Noxious Weed Law
  • Massachusetts - Noxious Weed Law
  • Tennessee - EPPC List
  • Vermont - Noxious Weed Law
  • Washington - Noxious Weed Law
  • Mid-Atlantic - EPPC List
  • Invasive Plant Atlas of New England


External Links


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USDA Forest Service Bugwood University of Georgia