American Journal of Science, and Arts ser. 2, 6:225. 1848
Phenology: Flowering summer–fall.
Habitat: Waters of lakes, ponds, streams, and rivers
Elevation: 0–1900(–2900) m
B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., Que., Sask., Ala., Ark., Calif., Conn., Ga., Idaho, Ill., Ind., Iowa, Kans., Maine, Md., Mass., Mich., Minn., Mo., Mont., Nebr., N.H., N.J., N.Y., N.C., Ohio, Okla., Oreg., Pa., R.I., S.Dak., Tenn., Vt., Va., Wash., W.Va., Wis., Wyo.
No specimens have been seen from Kentucky or Texas, but the species is to be expected there.
Potamogeton amplifolius is common throughout much of North America. Its submersed leaves are larger than those of most other species of Potamogeton, are arcuate, and have more veins than do any other species.
One hybrid, Potamogeton amplifolius × P. illinoensis (= P. × scoliophyllus Hagström), has been described.