Potamogeton filiformis var. macounii (Morong ex Macoun) Morong

Potamogeton filiformis var. macounii (Morong ex Macoun) Morong is a synonym sensu FNA Ed. Comm., 2000 of:

Stuckenia filiformis (Persoon) Börner, an accepted species name sensu FNA Ed. Comm., 2000.