Hill's pondweed (Potamogeton hillii) COSEWIC assessment and status report: chapter 10
Existing Protection or Other Status Designations
Potamogeton hilliiwas designated as Special Concern in 1986 by COSEWIC and has a national rank of N2 (imperiled). It is considered Threatened by the Ontario Ministry of Natural Resources, and has a subnational (provincial) rank of S2 (imperiled) in Ontario. In the United States, it is designated as Endangered in Connecticut, Ohio, and Pennsylvania, Threatened in Michigan and New York, and listed as Special Concern in Massachusetts (USDA, NRCS, 2002). Nature Serve (2005) lists Potamogeton hillii as having a global rank of G3 (vulnerable), since it is uncommon throughout its range and susceptible to changes in water quality. The following subnational ranks for the United States are derived from NatureServe (2005): Connecticut (S1), Massachusetts (S3), Michigan (S2), New York (S2), Ohio (S1), Pennsylvania (S1), Vermont (S3), Virginia (S1), Wisconsin (S1).
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