Potamogeton perfoliatus subsp. richardsonii (A. Bennett) Hultén

Potamogeton perfoliatus subsp. richardsonii (A. Bennett) Hultén is a synonym sensu FNA Ed. Comm., 2000 of:

Potamogeton richardsonii (A. Bennett) Rydberg, an accepted species name sensu FNA Ed. Comm., 2000.