Publication: Hist. Stirp. Fl. Petrop. 43. 1845.

Origin: Native

Herbarium search: CPNWH

Notes: FNA22: "Potamogeton friesii is a fairly common linear-leaved species, especially of calcareous waters of lakes and streams of the upper Midwest. Whenever turions are present, the species is easily identified, as it is the only one with the outer leaves of the turions having corrugate bases and the inner leaves turned at right angles to the outer leaves.

Two hybrids, Potamogeton friesii x P. pusillus (= P. x pusilliformis Fischer [P. ´ intermedius Fischer]) and P. friesii x P. obtusifolius (= P. x semifructus A. Bennett ex Ascherson & Graebner), have been described."

Last updated 9/17/2023 by David Giblin.