Publication: Encyclopedie Methodique. Botanique ... Supplement. 4(2): 5354. 1816.
selected vouchers: WTU
Notes: FNA22: "Six hybrids, Potamogeton gramineus x P. nodosus (= P. x argutulus Hagström), P. illinoensis x P. nodosus (= P. x faxonii Morong), P. nodosus x P. richardsonii (= P. x rectifolius A. Bennett), P. natans x P. nodosus (= P. x schreberi Fischer [P. x perplexus A. Bennett]), P. alpinus x P. nodosus (= P. x subotusus Hagström), and P. epihydrus x P. nodosus (= P. x subsessilis Hagström), have been described.
Potamogeton nodosus is a common floating-leaved species throughout much of the United States and southern Canada. When both submersed and floating leaves are present, it is very easily recognized by the petioles of the submersed leaves being longer than 5 cm."
Stem anatomy is useful to distinguish P. nodosus from the hybrid P. gramineus × natans (BCIL7)