Basis for Former Listing
Potamogeton vaseyi is an aquatic macrophyte that inhabits small, soft water lakes in the northeastern portion of North America. It is reported to be an uncommon species across its range (Haynes and Hellquist 2000), but it seems to be especially uncommon in Minnesota, where it reaches the very western edge of its range. Several threats to the species' habitat have been identified including declining water quality, which seems to be a statewide trend, and the accelerating invasion of non-native species, which seems to be a worldwide trend. Potamogeton vaseyi was listed as a special concern species in Minnesota in 1984.
Basis for Delisting
Recent botanical searches by the Minnesota Biological Survey discovered P. vaseyi in just over 120 lakes of more than 2,000 lakes that were surveyed. It is now known to be more common and widespread than once thought to be. Special concern status is no longer necessary, and Potamogeton vaseyi was delisted in 2013.