Ogden's Pondweed (Potamogeton ogdenii) COSEWIC assessment and status report: chapter 10

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Existing Protection or Other Status Designations

Ogden’s pondweed has only recently been recognized as occurring in Ontario. It is not listed in the Ontario Plant List (Newmaster et al., 1998) nor is it found in the last published rare plant list from NHIC (Oldham, 1999). The more recent listing on the NHIC website (NHIC, 2005) does include Ogden’s pondweed with a subnational (provincial) rank of SH (Historical and possibly extirpated).

On the NatureServe Explorer website (NatureServe, 2005), Ogden’s pondweed has a Global Rank of G1 (Critically Imperiled). In the United States, it is listed as N1 (Critically Imperiled). In the four US states in which it occurs (Connecticut, Massachusetts, New York, and Vermont), Ogden’s pondweed is listed as S1 and is designated as Endangered in Massachusetts and New York (USDA, NRCS, 2005).