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Family: Potamogetonaceae
  Genus: Potamogeton

    Potamogeton alpinus Balb.*+
        alpine pondweed, red pondweed
             Potamogeton alpinus Balb. subsp. tenuifolius
             Potamogeton alpinus Balb. var. alpinus
             Potamogeton alpinus Balb. var. subellipticus (Fernald) Ogden
             Potamogeton alpinus Balb. var. tenuifolius (Raf.) Ogden
             Potamogeton tenuifolius Raf.
             Potamogeton tenuifolius Raf. var. subellipticus Fernald
    Potamogeton alpinus Balb. X P. richardsonii (A.Benn.) Rydb.+
    Potamogeton amplifolius Tuck.*+
        big-leaved pondweed, broad-leaved pondweed, large-leaved pondweed
    Potamogeton amplifolius Tuck. X P. praelongus Wulfen*+
             Potamogeton praelongus Wulfen X P. amplifolius Tuck.
    Potamogeton bicupulatus Fernald*+
        snail-seed pondweed
             Potamogeton diversifolius Raf., pro parte
             Potamogeton diversifolius Raf. var. trichophyllus Morong
    Potamogeton confervoides Rchb.*+
        alga pondweed, algal-leaved pondweed, algae-like pondweed, Tuckerman's pondweed
             Potamogeton tuckermanii J.W.Robbins
    Potamogeton crispus L.*+
        curled pondweed, curly pondweed
    Potamogeton diversifolius Raf.*+
        common snail-seed pondweed, water-thread pondweed
             Potamogeton capillaceus Poir., pro parte
             Potamogeton capillaceus Poir. var. atripes Fernald
             Potamogeton diversifolius Raf. var. multidenticulatus (Morong) Aschers. & Graebn.
    Potamogeton epihydrus Raf.*+
        ribbon-leaf pondweed, ribbon-leaved pondweed
             Potamogeton epihydrus Raf. subsp. nuttallii
             Potamogeton epihydrus Raf. var. cayugensis (Wiegand) A.Benn.
             Potamogeton epihydrus Raf. var. nuttallii (Cham. & Schltdl.) Fernald
             Potamogeton epihydrus Raf. var. ramosus (Peck) House
             Potamogeton epihydrus Raf. var. typicus Fernald
    Potamogeton foliosus Raf.
        leafy pondweed
    Potamogeton foliosus Raf. subsp. foliosus*+
        leafy pondweed
             Potamogeton curtissii Morong
             Potamogeton foliosus Raf. var. foliosus
             Potamogeton foliosus Raf. var. genuinus Fernald
             Potamogeton foliosus Raf. var. macellus Fernald
    Potamogeton friesii Rupr.*+
        Fries's pondweed
    Potamogeton gramineus L.*+
        grass-leaved pondweed, variable-leaved pondweed
             Potamogeton gramineus L. var. graminifolius Fr.
             Potamogeton gramineus L. var. maximus Morong ex A.Benn.
             Potamogeton gramineus L. var. myriophyllus J.W.Robbins
             Potamogeton gramineus L. var. typicus Ogden
             Potamogeton heterophyllus auct. non Schreb.
    Potamogeton hillii Morong*+
        Hill's pondweed
             Potamogeton porteri Fernald
    Potamogeton illinoensis Morong*+
        Illinois pondweed
             Potamogeton angustifolius Bercht. & C.Presl.
             Potamogeton lucens auct. non L.
    Potamogeton illinoensis Morong X P. richardsonii (A.Benn.) Rydb.+
    Potamogeton natans L.*+
        common pondweed, floating pondweed, floating-leaf pondweed
    Potamogeton nodosus Poir.*+
        long-leaf pondweed, long-leaved pondweed
             Potamogeton americanus Cham. & Schltdl.
             Potamogeton fluitans auct. non Roth
    Potamogeton oakesianus J.W.Robbins+
        Oakes' pondweed
    Potamogeton obtusifolius Mert. & W.D.J.Koch*+
        blunt-leaved pondweed
    Potamogeton perfoliatus L.
        clasping-leaf pondweed, perfoliate pondweed, red-head-grass
             Potamogeton bupleuroides Fernald
             Potamogeton perfoliatus L. subsp. bupleuroides
             Potamogeton perfoliatus L. var. bupleuroides (Fernald) Farw.
    Potamogeton praelongus Wulfen*+
        white-stemmed pondweed
             Potamogeton praelongus Wulfen var. angustifolius Graebn.
    Potamogeton praelongus Wulfen X P. richardsonii (A.Benn.) Rydb.+
             Potamogeton richardsonii (A.Benn.) Rydb X P. praelongus Wulfen
    Potamogeton pulcher Tuck.+
        spotted pondweed
    Potamogeton pusillus L.+
        slender pondweed, small pondweed
             Potamogeton lateralis auct. pro parte, non Morong
    Potamogeton pusillus L. subsp. pusillus+
        broad-leaved small pondweed, slender pondweed, small pondweed
             Potamogeton panormitanus Biv.
             Potamogeton panormitanus Biv. var. major G.Fisch.
             Potamogeton panormitanus Biv. var. minor Biv.
             Potamogeton pusillus L. var. minor (Biv.) Fernald & B.G.Schub.
             Potamogeton pusillus L. var. pusillus
    Potamogeton pusillus L. subsp. tenuissimus*+
        narrow-leaved small pondweed, slender pondweed, small pondweed
             Potamogeton berchtoldii Fieber
             Potamogeton berchtoldii Fieber var. acuminatus Fieber
             Potamogeton berchtoldii Fieber var. berchtoldii
             Potamogeton berchtoldii Fieber var. colpophilus (Fernald) Fernald
             Potamogeton berchtoldii Fieber var. lacunatus (Hagstr.) Fernald
             Potamogeton berchtoldii Fieber var. mucronatus Fieber
             Potamogeton berchtoldii Fieber var. polyphyllus (Morong) Fernald
             Potamogeton berchtoldii Fieber var. tenuissimus (Mert. & W.D.J.Koch) Fernald
             Potamogeton pusillus L. var. mucronatus (Fieber) Graebn.
             Potamogeton pusillus L. var. tenuissimus Mert. & W.D.J.Koch
    Potamogeton richardsonii (A.Benn.) Rydb.*+
        Richardson's pondweed
             Potamogeton perfoliatus L. subsp. richardsonii
             Potamogeton perfoliatus L. var. richardsonii A.Benn.
    Potamogeton richardsonii (A.Benn.) Rydb. X Potamogeton sp.
    Potamogeton robbinsii Oakes*+
        fern pondweed, Robbins' pondweed
             Potamogeton robbinsii Oakes f. cultellatus Fassett
    Potamogeton spirillus Tuck.*+
        northern snail-seed pondweed, spiral-fruited pondweed
             Potamogeton dimorphus Raf., misapplied
    Potamogeton strictifolius A.Benn.*+
        narrow-leaved pondweed, stiff pondweed, straight-leaved pondweed
             Potamogeton pusillus L. var. rutiloides (Fernald) B.Boivin
             Potamogeton rutilus auct. non Wolfg.
             Potamogeton strictifolius A.Benn. var. rutiloides Fernald
             Potamogeton strictifolius A.Benn. var. typicus Fernald
    Potamogeton vaseyi J.W.Robbins*+
        Vasey's pondweed
             Potamogeton lateralis auct. pro parte, non Morong
    Potamogeton zosteriformis Fernald*+
        flat-stem pondweed, flat-stemmed pondweed
             Potamogeton compressus auct. non L.
             Potamogeton zosterifolius auct. non Schumach.
             Potamogeton zosterifolius Schumach. subsp. zosteriformis
             Potamogeton zosterifolius Schumach. var. americanus A.Benn.
    Potamogeton X griffithii A.Benn. (pro sp.) X +
        Griffith's pondweed
             Potamogeton alpinus Balb. X P. praelongus Wulfen
             Potamogeton praelongus Wulfen X P. alpinus Balb.
    Potamogeton X hagstroemii A.Benn. (pro sp.) X +
        Hagstroem's pondweed
             Potamogeton gramineus L. X P. richardsonii (A.Benn.) Rydb.
    Potamogeton X haynesii Hellq. & G.E.Crow X +
        Haynes' pondweed
             Potamogeton longiligulatus Fernald, p.p. non Morong
    Potamogeton X nericius Hagstr. X +
             Potamogeton alpinus Balb. X P. gramineus L.
             Potamogeton gramineus L. X P. alpinus Balb.
    Potamogeton X scoliophyllus Hagstr. X +
             Potamogeton amplifolius Tuck. X P. illinoensis Morong
             Potamogeton illinoensis Morong X P. amplifolius Tuck.
    Potamogeton X spathuliformis (J.W.Robbins) Morong (pro sp.) X +
             Potamogeton gramineus L. X P. illinoensis Morong
             Potamogeton illinoensis Morong X P. gramineus L.
             Potamogeton varians Morong
    Potamogeton X subsessilis Hagstr. X +
             Potamogeton epihydrus Raf. X P. nodosus Poir.
  Genus: Stuckenia

    Stuckenia filiformis (Pers.) Börner+
        fine-leaved pondweed, thread-leaf pondweed, thread-leaved pondweed
    Stuckenia filiformis (Pers.) Börner subsp. alpina+
        fine-leaved pondweed, thread-leaf pondweed, thread-leaved pondweed
             Coleogeton filiformis (Pers.) Les & R.R.Haynes subsp. alpinus
             Potamogeton borealis Raf.
             Potamogeton filiformis Pers. subsp. alpinus
             Potamogeton filiformis Pers. var. alpinus (Blytt) Asch. & Graebn.
             Potamogeton filiformis Pers. var. borealis (Raf.) H.St.John
             Potamogeton filiformis Pers. var. macounii Morong
             Potamogeton interior Rydb.
             Potamogeton marinus L. f. alpinus Blytt
             Potamogeton marinus L. var. macounii Morong
    Stuckenia filiformis (Pers.) Börner subsp. occidentalis+
        fine-leaved pondweed, thread-leaf pondweed, thread-leaved pondweed
             Coleogeton filiformis (Pers.) Les & R.R.Haynes subsp. occidentalis
             Potamogeton filiformis Pers. subsp. occidentalis
             Potamogeton filiformis Pers. var. occidentalis (J.W.Robbins) Morong
             Potamogeton marinus L. var. (?) occidentalis J.W.Robbins
             Potamogeton punense A.Galan.
    Stuckenia pectinata (L.) Börner*+
        comb pondweed, sago pondweed
             Coleogeton pectinatus (L.) Les & R.R.Haynes
             Potamogeton pectinatus L.
    Stuckenia vaginata (Turcz.) Holub*+
        big-sheath pondweed, sheathed pondweed
             Coleogeton vaginatus (Turcz.) Les & R.R.Haynes
             Potamogeton interruptus Kit.
             Potamogeton vaginatus Turcz.

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