CPC Plant Profile: Ogden's Pondweed
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Plant Profile

Ogden's Pondweed (Potamogeton ogdenii)

  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Potamogetonaceae
  • State: CT, MA, NY, ON, VT
  • Nature Serve ID: 151664
  • Date Inducted in National Collection:

Potamogeton ogdennii, or Ogden’s pondweed, is an aquatic annual plant. Its leaves are 2-3 inches long and very skinny (less than 1/10th of an inch wide). The flowers are held on stalks above the surface of the water, but fruits are uncommon. Vegetative budding during the winter is probably its most common method of reproduction. Potamogeton ogdennii is primarily threatened by aquatic invasive species and the herbicides that are used to control them. As well as by human actives that disturb its habitat. (COSWEC, 2007; Smith, 2016; NatureServe, 2018; New England Wildflower Society, 2018)

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Taxon Potamogeton ogdenii
Authority Hellquist & Hilton
Family Potamogetonaceae
CPC Number 6487
ITIS 504554
Common Names Ogden's Pondweed
Associated Scientific Names Potamogeton ogdenii
Distribution Potamogeton ogdennii has an extremely restricted range in the upper Northeast USA and Ontario, Canada. As of 2016, it was only known from 9-11 locations, and it possibly extinct in Ontario. The global population trend is believed to be declining. P. ogdennii is classified as Vulnerable by the ICUN Red List criteria, as Critically Imperiled by NatureServe, and has regional Endangered status in Connecticut, Massachusetts and Ontario.

(COSWEC, 2007; Smith, 2016; NatureServe, 2018; USDA and NRCS. 2018)
State Rank
State State Rank
Connecticut S1
Massachusetts S1
New York S1
Ontario SH
Vermont S1

Potamogeton ogdennii grows completely submerged in alkaline lakes, beaver ponds or slow-moving streams.

(COSWEC, 2007; New England Wildflower Society, 2018)

Ecological Relationships

Common Name Name in Text Association Type Source InteractionID
Lead Institution State Reintroduction Type Year of First Outplanting

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