| Potamogeton × absconditus Z.Kaplan, Fehrer & Hellq. | Accepted |  | WCSP |  | 
	
		| Potamogeton acifolius Ma [Invalid] | Synonym |  | WCSP |  | 
	
		| Potamogeton acuminatus Schumach. | Synonym |  | WCSP |  | 
	
		| Potamogeton acuminatus Wahlenb. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton acutifolius Link ex Roem. & Schult. | Accepted |  | WCSP |  | 
	
		| Potamogeton acutifolius J.Presl & C.Presl [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton acutifolius Hornem. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton acutifolius subsp. mandschuriensis A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × acutus (G.Fisch.) Papch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × aemulans Z.Kaplan, Hellq. & Fehrer | Accepted |  | WCSP |  | 
	
		| Potamogeton affinis Boenn. ex Cham. & Schlecht. | Synonym |  | WCSP |  | 
	
		| Potamogeton alatofructus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton alatus Koidz. | Synonym |  | WCSP |  | 
	
		| Potamogeton alpinonatans F.W.Schultz | Synonym |  | WCSP |  | 
	
		| Potamogeton alpinus Hegetschw. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton alpinus Balb. | Accepted |  | WCSP |  | 
	
		| Potamogeton alpinus subsp. alpinus | Synonym |  | WCSP |  | 
	
		| Potamogeton alpinus var. angustifolius Baguet | Synonym |  | WCSP |  | 
	
		| Potamogeton alpinus var. faxonii Stevens | Synonym |  | WCSP |  | 
	
		| Potamogeton alpinus var. obscurus (DC.) Baguet | Synonym |  | WCSP |  | 
	
		| Potamogeton alpinus var. subellipticus (Fernald) Ogden | Synonym |  | WCSP |  | 
	
		| Potamogeton alpinus var. tenuifolius (Raf.) Ogden | Synonym |  | WCSP |  | 
	
		| Potamogeton alpinus subsp. tenuifolius (Raf.) Hultén | Accepted |  | WCSP |  | 
	
		| Potamogeton amblyophyllus C.A.Mey. | Synonym |  | WCSP |  | 
	
		| Potamogeton americanus Roem. & Schult. | Synonym |  | WCSP |  | 
	
		| Potamogeton americanus Cham. & Schltdl. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton americanus subsp. mascarensis (Cham. & Schltdl.) A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton americanus var. novaeboracensis (Morong) A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton americanus var. richardii (Solms) Solms ex Schweinf. | Synonym |  | WCSP |  | 
	
		| Potamogeton americanus var. thunbergii (Cham. & Schltdl.) A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton amplexicaulis Kar. | Synonym |  | WCSP |  | 
	
		| Potamogeton amplifolius Tuck. | Accepted |  | WCSP |  | 
	
		| Potamogeton amplifolius f. amphibius A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton amplifolius f. homophyllus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton amplifolius var. ovalifolius Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton anadyrensis V.N.Vassil. | Synonym |  | WCSP |  | 
	
		| Potamogeton anglicus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × anguillanus Koidz. | Accepted |  | WCSP |  | 
	
		| Potamogeton anguillanus Koidz. | Unresolved |  | TRO |  | 
	
		| Potamogeton × angustifolius J.Presl | Accepted |  | WCSP |  | 
	
		| Potamogeton angustifolius Bercht. & J.Presl ex Opiz | Synonym |  | WCSP |  | 
	
		| Potamogeton angustifolius Bercht. & J. Presl | Unresolved |  | TRO |  | 
	
		| Potamogeton angustifolius var. connecticutensis (J.W.Robbins) A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton angustifolius f. longipedunculatus (Tiselius) A.A.Bobrov & Chemeris | Synonym |  | WCSP |  | 
	
		| Potamogeton angustifolius var. methyensis A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton angustissimus Kunth | Synonym |  | WCSP |  | 
	
		| Potamogeton annulatus Bellardi | Synonym |  | WCSP |  | 
	
		| Potamogeton antaicus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton × apertus Miki | Accepted |  | WCSP |  | 
	
		| Potamogeton apicalis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton applanatus Y.D.Chen | Synonym |  | WCSP |  | 
	
		| Potamogeton argutulus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton argutulus var. nodosifolius A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton argutulus f. puyensis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton aschersonii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton aschersonii f. pusilloides Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton asiaticus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × assidens Z.Kaplan, Zalewska-Gał. & Ronikier | Accepted |  | WCSP |  | 
	
		| Potamogeton × attenuatus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton × attenuatus var. polygoniformis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton augustani Bellardi | Synonym |  | WCSP |  | 
	
		| Potamogeton augustanus Balb. | Synonym |  | WCSP |  | 
	
		| Potamogeton aulacophyllus K.Schum. | Synonym |  | WCSP |  | 
	
		| Potamogeton australiensis A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton australis F.Phil. ex Phil. | Synonym |  | WCSP |  | 
	
		| Potamogeton austriacus Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton austrosibiricus Kashina | Synonym |  | WCSP |  | 
	
		| Potamogeton × babingtonii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × babingtonii f. danicus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton badiovirens Hagstr. ex Skottsb. | Synonym |  | WCSP |  | 
	
		| Potamogeton badioviridis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton badius Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton baenitzii Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton balatonicus (Gams) Soó | Synonym |  | WCSP |  | 
	
		| Potamogeton bambergensis G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × bennettii Fryer | Accepted |  | WCSP |  | 
	
		| Potamogeton berchtoldii Fieber | Accepted |  | WCSP |  | 
	
		| Potamogeton berchtoldii subsp. berchtoldii | Synonym |  | WCSP |  | 
	
		| Potamogeton berchtoldii var. berchtoldii | Synonym |  | TRO |  | 
	
		| Potamogeton berchtoldii subsp. clystocarpus (Fernald) Les & Tippery | Accepted |  | WCSP |  | 
	
		| Potamogeton berchtoldii var. colpophilus Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton berchtoldii subsp. gemmiparus (J.W.Robbins) Les & Tippery | Accepted |  | WCSP |  | 
	
		| Potamogeton berchtoldii subsp. groenlandicus (Hagstr.) Feilberg | Synonym |  | WCSP |  | 
	
		| Potamogeton berchtoldii var. lacunatus (Hagstr.) Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton berchtoldii var. major Nakai | Synonym |  | WCSP |  | 
	
		| Potamogeton berchtoldii var. mucronatus Fielding | Synonym |  | WCSP |  | 
	
		| Potamogeton berchtoldii var. polyphyllus (Morong) Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton berchtoldii var. ramosissimus Fieber | Synonym |  | WCSP |  | 
	
		| Potamogeton berchtoldii subsp. tenuissimus (Mert. & W.D.J.Koch) Calder & Roy L.Taylor | Synonym |  | WCSP |  | 
	
		| Potamogeton berchtoldii var. tenuissimus (Mert. & W.D.J.Koch) Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton berteroanus Phil. | Synonym |  | WCSP |  | 
	
		| Potamogeton besseri Steud. | Synonym |  | WCSP |  | 
	
		| Potamogeton bicupulatus Fernald | Accepted |  | WCSP |  | 
	
		| Potamogeton bifolius Lapeyr. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton biformis Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton biformoides Papch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × bifrons Hagstr. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton × billotii F.W.Schultz | Synonym |  | WCSP |  | 
	
		| Potamogeton × billupsii Fryer | Accepted |  | WCSP |  | 
	
		| Potamogeton × biwaensis Miki | Accepted |  | WCSP |  | 
	
		| Potamogeton borealis Raf. | Synonym |  | WCSP |  | 
	
		| Potamogeton borealis Kihlm. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton × bottnicus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton bracteatus Y.D.Chen | Synonym |  | WCSP |  | 
	
		| Potamogeton brasiliensis (A.Benn.) A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton bunyonyiensis Denny & Lye | Synonym |  | WCSP |  | 
	
		| Potamogeton bupleuroides Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton burkartii Horn | Synonym |  | WCSP |  | 
	
		| Potamogeton × burtonii E.Hopkins ex Syme | Synonym |  | WCSP |  | 
	
		| Potamogeton × cadburyae Dandy & G.Taylor | Accepted |  | WCSP |  | 
	
		| Potamogeton caespitosus Humn. | Synonym |  | WCSP |  | 
	
		| Potamogeton caespitosus Nolte [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton californicus (Morong) Piper | Synonym |  | WCSP |  | 
	
		| Potamogeton canariensis Link | Synonym |  | WCSP |  | 
	
		| Potamogeton capensis Schelle ex Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton capillaceus Poir. | Synonym |  | WCSP |  | 
	
		| Potamogeton capillaceus var. atripes Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton caricifolius Wolfg. | Synonym |  | WCSP |  | 
	
		| Potamogeton carinatus Kupffer | Synonym |  | WCSP |  | 
	
		| Potamogeton casparii Weyl | Synonym |  | WCSP |  | 
	
		| Potamogeton caudatus Seidl ex Opiz [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton cayugensis (Wiegand) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton cespitosus Rchb.f. | Synonym |  | WCSP |  | 
	
		| Potamogeton chakassiensis (Kashina) Volobaev | Synonym |  | WCSP |  | 
	
		| Potamogeton chakassiensis var. tenuior Volobaev | Synonym |  | WCSP |  | 
	
		| Potamogeton chamissoi A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton × champlainii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton cheesemanii A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton cheesemanii f. tasmanicus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton chongyangensis W.X.Wang | Accepted |  | WCSP |  | 
	
		| Potamogeton claytonii Tuck. | Synonym |  | WCSP |  | 
	
		| Potamogeton clystocarpus Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton × cognatus Asch. & Graebn. | Accepted |  | WCSP |  | 
	
		| Potamogeton coloratus Hornem. | Accepted |  | WCSP |  | 
	
		| Potamogeton coloratus var. jamaicensis Griseb. | Synonym |  | WCSP |  | 
	
		| Potamogeton coloratus var. siculus Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton coloratus subsp. subflavus (Loret & Barrandon) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton columbianus Suksd. | Synonym |  | WCSP |  | 
	
		| Potamogeton complanatus Willd. | Synonym |  | WCSP |  | 
	
		| Potamogeton compressus L. | Accepted |  | WCSP |  | 
	
		| Potamogeton compressus var. acutus Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton compressus var. dimidius Crép. | Synonym |  | WCSP |  | 
	
		| Potamogeton compressus var. elongatus Wahlenb. | Synonym |  | WCSP |  | 
	
		| Potamogeton compressus var. obtusus Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton concinnitus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton condylocarpus Tausch | Synonym |  | WCSP |  | 
	
		| Potamogeton confervoides Rchb. | Accepted |  | WCSP |  | 
	
		| Potamogeton × confinis Hagstr. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton conjungens Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton contortus Desf. | Synonym |  | WCSP |  | 
	
		| Potamogeton × cooperi (Fryer) Fryer | Accepted |  | WCSP |  | 
	
		| Potamogeton coriaceus (Nolte ex Mert. & W.D.J.Koch) Fryer | Synonym |  | WCSP |  | 
	
		| Potamogeton corniculatus Schur | Synonym |  | WCSP |  | 
	
		| Potamogeton cornutus J.Presl & C.Presl | Synonym |  | WCSP |  | 
	
		| Potamogeton × crassifolius Fryer | Synonym |  | WCSP |  | 
	
		| Potamogeton × crassifolius f. verrutus Fryer | Synonym |  | WCSP |  | 
	
		| Potamogeton crassipes Kit. ex Cham. & Schlecht. | Synonym |  | WCSP |  | 
	
		| Potamogeton crenulatus D.Don | Synonym |  | WCSP |  | 
	
		| Potamogeton crispatus Wallman ex Rchb. | Synonym |  | WCSP |  | 
	
		| Potamogeton crispus L. | Accepted |  | WCSP |  | 
	
		| Potamogeton crispus var. gemmifer Rchb. | Synonym |  | WCSP |  | 
	
		| Potamogeton crispus var. macrorrhynchus (Gand.) Asch. & Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton crispus var. najadoides Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton crispus var. phialiensis Post | Synonym |  | WCSP |  | 
	
		| Potamogeton crispus var. serrulatus (Opiz) Schrad. ex Rchb. | Synonym |  | WCSP |  | 
	
		| Potamogeton cristatus Regel & Maack | Accepted |  | WCSP |  | 
	
		| Potamogeton curtisii Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton curvatus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × curvifolius Hartm. | Synonym |  | WCSP |  | 
	
		| Potamogeton cuspidatus Schrad. ex Mert. & W.D.J.Koch | Synonym |  | WCSP |  | 
	
		| Potamogeton cuspidatus Schrad. | Synonym |  | WCSP |  | 
	
		| Potamogeton × cymatodes Asch. & Graebn. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton × cymbifolius G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton cyprifolius Lowe ex Graebn. [Invalid] | Synonym |  | WCSP |  | 
	
		| Potamogeton danicus Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton × decipiens Nolte ex W.D.J.Koch | Synonym |  | WCSP |  | 
	
		| Potamogeton × decipiens Nolte ex Koch | Synonym |  | TRO |  | 
	
		| Potamogeton × decipiens var. longifolius Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton × decipiens var. salicifolius (Wolfg.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton × decipiens var. torssandrii Tiselius | Synonym |  | WCSP |  | 
	
		| Potamogeton delavayi A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton delicatulus Bertol. | Synonym |  | WCSP |  | 
	
		| Potamogeton × deminutus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton densus L. | Synonym |  | WCSP |  | 
	
		| Potamogeton densus var. serratus (L.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton densus subsp. serratus (L.) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton densus var. setaceus (L.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton densus subsp. setaceus (L.) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton dentatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton denticulatus Link | Synonym |  | WCSP |  | 
	
		| Potamogeton diffusus Herter | Synonym |  | WCSP |  | 
	
		| Potamogeton digynus Wall. [Invalid] | Synonym |  | WCSP |  | 
	
		| Potamogeton dimorphoides Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton dimorphus Raf. | Synonym |  | WCSP |  | 
	
		| Potamogeton dissimilis A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton distachyus Bellardi | Synonym |  | WCSP |  | 
	
		| Potamogeton distinctus A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton distinctus var. tonkinensis (E.G.Camus) V.C.Vu ex Aver. | Synonym |  | WCSP |  | 
	
		| Potamogeton divaricatus Wolfg. | Synonym |  | WCSP |  | 
	
		| Potamogeton diversifolius Raf. | Accepted |  | WCSP |  | 
	
		| Potamogeton diversifolius W.P.C.Barton [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton diversifolius var. diversifolius | Synonym |  | TRO |  | 
	
		| Potamogeton diversifolius f. limosus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton diversifolius var. multidenticulatus Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton diversifolius var. trichophyllus Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton drucei Fryer | Synonym |  | WCSP |  | 
	
		| Potamogeton drummondii Benth. | Accepted |  | WCSP |  | 
	
		| Potamogeton drupaceus O.Lang | Synonym |  | WCSP |  | 
	
		| Potamogeton dualis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × dubius Tiselius | Synonym |  | WCSP |  | 
	
		| Potamogeton dunicola Tur | Synonym |  | WCSP |  | 
	
		| Potamogeton elipticum Larrañaga | Synonym |  | WCSP |  | 
	
		| Potamogeton epihydrus Raf. | Accepted |  | WCSP |  | 
	
		| Potamogeton epihydrus var. cayugensis A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton epihydrus var. epihydrus | Synonym |  | TRO |  | 
	
		| Potamogeton epihydrus var. nuttallii (Cham. & Schltdl.) Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton epihydrus subsp. nuttallii (Cham. & Schltdl.) Calder & Roy L.Taylor | Synonym |  | WCSP |  | 
	
		| Potamogeton epihydrus var. ramosus House | Synonym |  | WCSP |  | 
	
		| Potamogeton erhaiensis Y.D.Chen | Synonym |  | WCSP |  | 
	
		| Potamogeton exiguus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × exilis Z.Kaplan & Uotila | Accepted |  | WCSP |  | 
	
		| Potamogeton exstipulatus Muhl. | Synonym |  | WCSP |  | 
	
		| Potamogeton exstipulatus Wolfg. | Synonym |  | WCSP |  | 
	
		| Potamogeton falcatus Fryer | Synonym |  | WCSP |  | 
	
		| Potamogeton × fallax Asch. & Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton fasciculatus Wolfg. | Synonym |  | WCSP |  | 
	
		| Potamogeton × faurei (A.Benn.) Miki | Accepted |  | WCSP |  | 
	
		| Potamogeton × faxonii Morong | Accepted |  | WCSP |  | 
	
		| Potamogeton × fennicus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton ferrugineus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton fibrillosus Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton fibrosus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton fieberi Rouy | Synonym |  | WCSP |  | 
	
		| Potamogeton filicaulis Schur | Synonym |  | WCSP |  | 
	
		| Potamogeton filifolius Phil. | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis Pers. | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis Raf. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton filiformis Nolte | Misapplied |  | WCSP |  | 
	
		| Potamogeton filiformis Pursh ex Tuck. | Misapplied |  | WCSP |  | 
	
		| Potamogeton filiformis f. alpinus (Blytt) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. alpinus (Blytt) Almq. | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. alpinus (Blytt) Asch. & Graebn. | Synonym |  | TRO |  | 
	
		| Potamogeton filiformis var. applanatus (Y.D.Chen) Q.Y.Li | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. austrosibiricus (Kaschina) Czepinoga | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. borealis (Raf.) H.St.John | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis f. elongatus Baagøe ex G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. elongatus (Baagøe ex G.Fisch.) G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. fasciculatus (Wolfg.) Baagøe | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis f. fasciculatus (Wolfg.) Tiselius | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis f. fluviatilis (G.Fisch.) G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. juncifolius (A.Kern. ex C.Fritsch) Hegi | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis subsp. juncifolius (A.Kern. ex C.Fritsch) Asch. & Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. kihlmanii Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. latifolius (J.W.Robbins) Reveal | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. macounii (Morong ex Macoun) Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis var. occidentalis (J.W.Robbins) Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton filiformis f. polaris Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton flabellatus Bab. | Synonym |  | WCSP |  | 
	
		| Potamogeton flexuosus Hegetschw. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton flexuosus Wredow | Synonym |  | WCSP |  | 
	
		| Potamogeton flexuosus Schleich. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton floridanus Small | Accepted |  | WCSP |  | 
	
		| Potamogeton × fluitans Roth | Accepted |  | WCSP |  | 
	
		| Potamogeton fluitans Roth | Unresolved |  | TRO |  | 
	
		| Potamogeton × fluitans subsp. americanus Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans var. billotii (F.W.Schultz) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans subsp. billotii (F.W.Schultz) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans f. brevifolius G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans f. congestus G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans f. harzii (G.Fisch.) G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans f. latifolius G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans var. novaeboracensis (Morong) Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans var. petiolatus (Wolfg.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans var. robustus Tab.Morais | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans var. sessilis Herter | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans f. spathulifolius G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans var. stagnatilis W.D.J.Koch | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans var. sublucens Baagøe ex Asch. & Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × fluitans var. variifolius (Thore) Roem. & Schult. | Synonym |  | WCSP |  | 
	
		| Potamogeton foliosus Raf. | Accepted |  | WCSP |  | 
	
		| Potamogeton foliosus var. californicus (Morong) Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton foliosus f. californicus (Morong) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton foliosus var. fibrillosus (Fernald) R.R.Haynes & Reveal | Synonym |  | WCSP |  | 
	
		| Potamogeton foliosus subsp. fibrillosus (Fernald) R.R.Haynes & Hellq. | Accepted |  | WCSP |  | 
	
		| Potamogeton foliosus subsp. foliosus | Synonym |  | WCSP |  | 
	
		| Potamogeton foliosus var. foliosus | Synonym |  | TRO |  | 
	
		| Potamogeton foliosus var. macellus Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton foliosus var. niagarensis (Tuck.) Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton fontigenus Y.H.Guo, X.Z.Sun & H.Q.Wang | Accepted |  | WCSP |  | 
	
		| Potamogeton fragillimus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton franchetii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × franconicus G.Fisch. | Accepted |  | WCSP |  | 
	
		| Potamogeton friesii Rupr. | Accepted |  | WCSP |  | 
	
		| Potamogeton fryeri A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton fulvus Riddell [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton furcatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × gallicus Hagstr. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton gaudichaudii Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton gayi A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton gemmiparus (J.W.Robbins) Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton × gessnacensis G.Fisch. | Accepted |  | WCSP |  | 
	
		| Potamogeton gessnacensis G. Fisch. | Unresolved |  | TRO |  | 
	
		| Potamogeton glaucus Gueldenst. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton gracilis Wolfg. | Synonym |  | WCSP |  | 
	
		| Potamogeton gracilis Fr. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus L. | Accepted |  | WCSP |  | 
	
		| Potamogeton gramineus var. gramineus | Synonym |  | TRO |  | 
	
		| Potamogeton gramineus f. gramineus | Synonym |  | TRO |  | 
	
		| Potamogeton gramineus var. graminifolius Fr. | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus var. heterophyllus (Schreb.) Fr. | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus subsp. heterophyllus (Schreb.) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus subsp. heterophyllus Schinz & R. Keller | Synonym |  | TRO |  | 
	
		| Potamogeton gramineus var. lacustris Farw. | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus f. lanceolatifolius Tiselius | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus var. longipedunculatus (Mérat) Farw. | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus f. longipedunculatus (Mérat) House | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus f. maximus (Morong ex A.Benn.) House | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus var. maximus Morong ex A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus f. maximus Morong ex Bennett | Synonym |  | TRO |  | 
	
		| Potamogeton gramineus var. minimus (Morong) Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus f. myriophyllus (J.W.Robbins) House | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus var. myriophyllus J.W.Robbins | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus var. parvifolius Farw. | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus var. spathuliformis J.W.Robbins | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus f. spathuliformis J.W. Robbins | Synonym |  | TRO |  | 
	
		| Potamogeton gramineus f. terrestris (Schltdl.) D.S.Carp. | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus subsp. variifolius (Thore) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus var. wolfgangii (Kihlm.) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus subsp. wolfgangii (Kihlm.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton gramineus subsp. zizii (Mert. & W.D.J.Koch) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton graminifolius (Fr.) Benkö | Synonym |  | WCSP |  | 
	
		| Potamogeton × griffithii A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton grisebachii Heuff. | Synonym |  | WCSP |  | 
	
		| Potamogeton groenlandicus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × grovesii Dandy & G.Taylor | Accepted |  | WCSP |  | 
	
		| Potamogeton × hagstromii A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton × harzii G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × haynesii Hellq. & G.E.Crow | Accepted |  | WCSP |  | 
	
		| Potamogeton × heidenreichii Asch. & Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton helodes Dumort. | Synonym |  | WCSP |  | 
	
		| Potamogeton helveticus (G.Fisch.) W.Koch | Synonym |  | WCSP |  | 
	
		| Potamogeton helveticus var. balatonicus Gams | Synonym |  | WCSP |  | 
	
		| Potamogeton henningii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × henryi Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton herchtoldii Fieber | Unresolved |  | TRO |  | 
	
		| Potamogeton × heslop-harrisonii W.A.Clark [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton heterocaulis Z.S.Diao | Accepted |  | WCSP |  | 
	
		| Potamogeton heterophyllus Schreb. | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus Biroli [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus Elliott [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus Torr. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton × heterophyllus Fr. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus var. graminifolius (Fr.) S.Watson & J.M.Coult. | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus f. graminifolius (Fr.) Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus f. longipedunculatus (Mérat) Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus var. major Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus f. maximus (Morong ex A.Benn.) Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus f. minimus Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus f. myriophyllus (J.W.Robbins) Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton heterophyllus var. terrestris Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton hillii Morong | Accepted |  | WCSP |  | 
	
		| Potamogeton hindostanicus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton hoggarensis Dandy | Accepted |  | WCSP |  | 
	
		| Potamogeton hohenackeri Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton hornemannii G.Mey. | Synonym |  | WCSP |  | 
	
		| Potamogeton hubeiensis W.X.Wang, X.Z.Sun & H.Q.Wang | Synonym |  | WCSP |  | 
	
		| Potamogeton huillensis Welw. ex A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton hungaricus Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton hybridus Petagna | Synonym |  | WCSP |  | 
	
		| Potamogeton hybridus Michx. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton hybridus Thuill. | Synonym |  | TRO |  | 
	
		| Potamogeton hybridus var. multidenticulatus (Morong) Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton hybridus var. trichophyllus (Morong) Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton illinoensis Morong | Accepted |  | WCSP |  | 
	
		| Potamogeton illinoensis f. homophyllus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton illinoensis f. rosulatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton illinoensis var. ventanicolus (Hicken) Horn | Synonym |  | WCSP |  | 
	
		| Potamogeton × inbaensis Kadono | Accepted |  | WCSP |  | 
	
		| Potamogeton indicus Roth ex Roem. & Schult. | Synonym |  | WCSP |  | 
	
		| Potamogeton indicus Roxb. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton insulanus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton interior Rydb. | Synonym |  | WCSP |  | 
	
		| Potamogeton × intermedius G.Fisch. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton intermedius Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton interruptus Kit. | Synonym |  | WCSP |  | 
	
		| Potamogeton intortusifolius J.B.He, L.Y.Zhou & H.Q.Wang | Accepted |  | WCSP |  | 
	
		| Potamogeton intramongolicus Ma [Invalid] | Synonym |  | WCSP |  | 
	
		| Potamogeton × involutus (Fryer) H.Groves & J.Groves | Synonym |  | WCSP |  | 
	
		| Potamogeton iriomotensis Masam. | Accepted |  | WCSP |  | 
	
		| Potamogeton iwatensis Makino [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton × jacobsii Z.Kaplan, Fehrer & Hellq. | Accepted |  | WCSP |  | 
	
		| Potamogeton japonicus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton javanicus Hassk. | Synonym |  | WCSP |  | 
	
		| Potamogeton javanicus var. major Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton jeholensis Kitag. | Synonym |  | WCSP |  | 
	
		| Potamogeton × johannis Hesl.-Harr. | Synonym |  | WCSP |  | 
	
		| Potamogeton juncifolius A.Kern. ex C.Fritsch | Synonym |  | WCSP |  | 
	
		| Potamogeton juncifolius var. amphibius Baagøe ex G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton juncifolius var. fluviatilis G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × jutlandicus Zalewska-Gał. | Accepted |  | WCSP |  | 
	
		| Potamogeton juzepczukii P.I.Dorof. & Tzvelev | Accepted |  | WCSP |  | 
	
		| Potamogeton × kamogawaensis Miki | Accepted |  | WCSP |  | 
	
		| Potamogeton kashiensis Z.S.Diao | Accepted |  | WCSP |  | 
	
		| Potamogeton kirkii Syme | Synonym |  | WCSP |  | 
	
		| Potamogeton kochii F.W.Schultz | Synonym |  | WCSP |  | 
	
		| Potamogeton × kupffieri A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × kyushuensis Kadono & Wiegleb | Accepted |  | WCSP |  | 
	
		| Potamogeton kyushuensis Kadono & Wiegleb | Unresolved |  | TRO |  | 
	
		| Potamogeton lactucaceum Montandon | Synonym |  | WCSP |  | 
	
		| Potamogeton lacunatifolius Papch. | Accepted |  | WCSP |  | 
	
		| Potamogeton lacunatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton lacunatus f. novae-angliae Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × lanceolatifolius (Tiselius) C.D.Preston | Accepted |  | WCSP |  | 
	
		| Potamogeton × lanceolatus Sm. | Accepted |  | WCSP |  | 
	
		| Potamogeton lanceolatus Poir. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton lanceolatus Eichw. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton lanceolatus Mazziari [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton lanciformis Roem. & Schult. | Synonym |  | WCSP |  | 
	
		| Potamogeton lateralis Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton lateralis f. incompletus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton lateralis f. subcompletus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton laticaulis Wahlenb. | Synonym |  | WCSP |  | 
	
		| Potamogeton latifolius Sloboda | Synonym |  | WCSP |  | 
	
		| Potamogeton latifolius (J.W.Robbins) Morong [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton latior Holub | Synonym |  | WCSP |  | 
	
		| Potamogeton leptanthus Y.D.Chen | Synonym |  | WCSP |  | 
	
		| Potamogeton × leptocephalus Koidz. | Accepted |  | WCSP |  | 
	
		| Potamogeton leptophyllus Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton leschenaultii Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton liebmannii Buchenau | Synonym |  | WCSP |  | 
	
		| Potamogeton ligulatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton liljebladii Wallman ex Rchb. | Synonym |  | WCSP |  | 
	
		| Potamogeton limosellifolius Maxim. ex Korsh. | Synonym |  | WCSP |  | 
	
		| Potamogeton lindenbergii Lehm. ex Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton linearis Larrañaga | Synonym |  | WCSP |  | 
	
		| Potamogeton linguatus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton × lintonii Fryer | Accepted |  | WCSP |  | 
	
		| Potamogeton × lithuanicus Gorski ex Rchb. | Synonym |  | WCSP |  | 
	
		| Potamogeton livingstonei A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton loculosus Hagstr. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton loeselii Honck. | Synonym |  | WCSP |  | 
	
		| Potamogeton lonchites Tuck. | Synonym |  | WCSP |  | 
	
		| Potamogeton lonchites var. novaeboracensis Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton longifolius J.Gay ex Poir. | Synonym |  | WCSP |  | 
	
		| Potamogeton × longifolius Bab. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton longiligulatus Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton longipedunculatus Mérat | Synonym |  | WCSP |  | 
	
		| Potamogeton longipetiolatus E.G.Camus | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens L. | Accepted |  | WCSP |  | 
	
		| Potamogeton lucens var. acuminatus (Schumach.) Fr. | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens subsp. brasiliensis A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens var. connecticutensis J.W.Robbins | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens var. coriaceus Nolte ex Mert. & W.D.J.Koch | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens var. floridanus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens var. fluitans Coss. & Germ. | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens f. longifolius (J.Gay ex Poir.) Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens var. longifolius (J.Gay ex Poir.) Crép. | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens f. longipedunculatus Tiselius | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens subsp. macrophyllus (Wolfg.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens subsp. sinicus (Migo) H.Hara | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens var. teganumensis Makino | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens subsp. vaginans Bojer ex A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens var. ventanicolus Hicken | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens subsp. zizii (Mert. & W.D.J.Koch) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton lucens var. zizii (Koch ex Roth) Asch. | Synonym |  | WCSP |  | 
	
		| Potamogeton lucidus Gueldenst. | Synonym |  | WCSP |  | 
	
		| Potamogeton × lundii K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton maackianus A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton machianus Lowe ex Graebn. [Invalid] | Synonym |  | WCSP |  | 
	
		| Potamogeton macrocarpus Dobrocz. | Synonym |  | WCSP |  | 
	
		| Potamogeton macrophylloides Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton macrophyllus Wolfg. | Synonym |  | WCSP |  | 
	
		| Potamogeton macrorrhynchus Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton × macvicarii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × maemetsiae Zalewska-Gał. & Ronikier | Accepted |  | WCSP |  | 
	
		| Potamogeton magellanicus (Hagstr.) Dusén | Synonym |  | WCSP |  | 
	
		| Potamogeton major Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton malaianus Miq. | Synonym |  | WCSP |  | 
	
		| Potamogeton malaianus var. latifolius Nakai ex Mori | Synonym |  | WCSP |  | 
	
		| Potamogeton malaianus var. tenuior Miq. | Synonym |  | WCSP |  | 
	
		| Potamogeton × malainoides Miki | Accepted |  | WCSP |  | 
	
		| Potamogeton mandschuriensis (A.Benn.) A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton manschuriensis Bennell | Unresolved |  | TRO |  | 
	
		| Potamogeton marianensis Cham. & Schltdl. | Accepted |  | WCSP |  | 
	
		| Potamogeton × mariensis Papch. | Accepted |  | WCSP |  | 
	
		| Potamogeton marinus L. | Synonym |  | WCSP |  | 
	
		| Potamogeton marinus var. alpinus Blytt | Synonym |  | WCSP |  | 
	
		| Potamogeton marinus f. alpinus Blytt | Synonym |  | TRO |  | 
	
		| Potamogeton marinus var. macounii Morong ex Macoun | Synonym |  | WCSP |  | 
	
		| Potamogeton marinus var. occidentalis J.W.Robbins | Synonym |  | WCSP |  | 
	
		| Potamogeton marinus var. setaceus Roth | Synonym |  | WCSP |  | 
	
		| Potamogeton maritima L. | Accepted |  | TRO |  | 
	
		| Potamogeton mascarensis Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton × meinshausenii Juz. | Synonym |  | WCSP |  | 
	
		| Potamogeton membranaceus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × methyensis (A.Benn.) A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton mexicanus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton microcarpus Boiss. & Reut. | Synonym |  | WCSP |  | 
	
		| Potamogeton microstachys Wolfg. | Synonym |  | WCSP |  | 
	
		| Potamogeton microstachys var. subellipticus Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton miduhikimo Makino | Synonym |  | WCSP |  | 
	
		| Potamogeton × miguelensis Dandy | Synonym |  | WCSP |  | 
	
		| Potamogeton millardii Hesl.-Harr. | Synonym |  | WCSP |  | 
	
		| Potamogeton miniatus Y.D.Chen | Synonym |  | WCSP |  | 
	
		| Potamogeton × mirabilis Z.Kaplan, Hellq. & Fehrer | Accepted |  | WCSP |  | 
	
		| Potamogeton miyakozimensis Honda | Synonym |  | WCSP |  | 
	
		| Potamogeton mizuhikimo Makino | Synonym |  | WCSP |  | 
	
		| Potamogeton moniliformis H.St.John | Synonym |  | WCSP |  | 
	
		| Potamogeton monoginus Miki [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton monogynus J.Gay | Synonym |  | WCSP |  | 
	
		| Potamogeton montanense Gand. | Unresolved |  | TRO |  | 
	
		| Potamogeton montanensis Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton montanus C.Presl | Synonym |  | WCSP |  | 
	
		| Potamogeton montevidensis A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton monticola Schwein. | Unresolved |  | TRO |  | 
	
		| Potamogeton morongii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus Schrad. ex Sond. | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus C.Presl [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus f. acutus G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus f. angustifolius (G.Fisch.) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus var. angustifolius G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus var. latifolius R.Ruthe ex G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus f. latifolius (R.Ruthe ex G.Fisch.) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus var. major R.Ruthe ex G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus f. minor Tiselius | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus var. obtusior (G.Fisch.) Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton mucronatus f. obtusior G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × mucronulatus (G.Fisch.) Papch. | Accepted |  | WCSP |  | 
	
		| Potamogeton muricatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × mysticus Morong | Accepted |  | WCSP |  | 
	
		| Potamogeton nanus Y.D.Chen | Synonym |  | WCSP |  | 
	
		| Potamogeton natans L. | Accepted |  | WCSP |  | 
	
		| Potamogeton natans var. canariensis (Link) T.Durand & Schinz | Synonym |  | WCSP |  | 
	
		| Potamogeton natans f. capensis Kunth | Synonym |  | WCSP |  | 
	
		| Potamogeton natans var. fluitans (Roth) Cham. | Synonym |  | WCSP |  | 
	
		| Potamogeton natans subsp. fluitans (Roth) Schübl. & G.Martens | Synonym |  | WCSP |  | 
	
		| Potamogeton natans f. indicus Miq. | Synonym |  | WCSP |  | 
	
		| Potamogeton natans subsp. kirkii (Syme) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton natans var. major W.D.J.Koch & Ziz | Synonym |  | WCSP |  | 
	
		| Potamogeton natans var. mexicanus M.Martens & Galeotti | Synonym |  | WCSP |  | 
	
		| Potamogeton natans var. minor Mert. & W.D.J.Koch ex Lej. & Courtois | Synonym |  | WCSP |  | 
	
		| Potamogeton natans var. petiolaris Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton natans var. petiolatus (Wolfg.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton natans subsp. petiolatus (Wolfg.) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton natans var. serotinus (Schrad. ex Schult. & Schult.f.) Boiss. | Synonym |  | WCSP |  | 
	
		| Potamogeton × nerbiger Wolfg. | Unresolved |  | TRO |  | 
	
		| Potamogeton × nericius Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton × nerviger Wolfg. | Accepted |  | WCSP |  | 
	
		| Potamogeton niagarensis Tuck. | Synonym |  | WCSP |  | 
	
		| Potamogeton nigrescens Fr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × nipponicus Makino | Synonym |  | WCSP |  | 
	
		| Potamogeton × nitens Weber | Accepted |  | WCSP |  | 
	
		| Potamogeton nitens Willd. ex Cham. & Schltdl. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton × nitens var. curvifolius (Hartm.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton × nitens subsp. curvifolius (Hartm.) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton × nitens f. involutus Fryer | Synonym |  | WCSP |  | 
	
		| Potamogeton × nitens var. occidentalis Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × nitens f. restrictus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton nodosus Poir. | Accepted |  | WCSP |  | 
	
		| Potamogeton nodosus f. angustissimus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton nodosus f. brevifolius (G.Fisch.) Soó | Synonym |  | WCSP |  | 
	
		| Potamogeton nodosus f. congestus (G.Fisch.) Soó | Synonym |  | WCSP |  | 
	
		| Potamogeton nodosus f. latifolius (G.Fisch.) Soó | Synonym |  | WCSP |  | 
	
		| Potamogeton nodosus f. spathulifolius (G.Fisch.) Soó | Synonym |  | WCSP |  | 
	
		| Potamogeton nodosus var. stagnatilis (W.D.J.Koch) Soó | Synonym |  | WCSP |  | 
	
		| Potamogeton × noltei G.Fisch. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton × noltei f. perlucens G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × noltei f. pernatans G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton nomotoensis Kadono & T.Nog. | Accepted |  | WCSP |  | 
	
		| Potamogeton notarisii Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton numasakianus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton nuttallii Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton nuttallii var. cayugensis Wiegand | Synonym |  | WCSP |  | 
	
		| Potamogeton nuttallii var. portoricensis (Graebn.) Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton nuttallii var. ramosus Peck | Synonym |  | WCSP |  | 
	
		| Potamogeton oakesianus J.W.Robbins | Accepted |  | WCSP |  | 
	
		| Potamogeton oblongifolius Hook.f. | Synonym |  | WCSP |  | 
	
		| Potamogeton oblongorufescens Schultz | Synonym |  | WCSP |  | 
	
		| Potamogeton oblongus Hegetschw. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton oblongus Viv. | Synonym |  | WCSP |  | 
	
		| Potamogeton × oblongus G.Mey. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton oblongus f. amphibius Fr. | Synonym |  | WCSP |  | 
	
		| Potamogeton oblongus var. fluitans (Roth) G.Mey. | Synonym |  | WCSP |  | 
	
		| Potamogeton oblongus f. lancifolius Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton obrutus Alph.Wood | Synonym |  | WCSP |  | 
	
		| Potamogeton obscurus DC. | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusifolius Mert. & W.D.J.Koch | Accepted |  | WCSP |  | 
	
		| Potamogeton obtusifolius f. acutus Fieber | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusifolius f. angustifolius (Fieber) Soó | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusifolius var. angustifolius Fieber | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusifolius f. apiculatus Fieber | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusifolius f. insolitus Tiselius | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusifolius var. latifolius Fieber | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusifolius f. latifolius (Fieber) Soó | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusifolius f. microcarpus Hyl. | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusifolius f. muticus Fieber | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusifolius f. obtusus Fieber | Synonym |  | WCSP |  | 
	
		| Potamogeton obtusus Ducros ex Gaud. | Synonym |  | WCSP |  | 
	
		| Potamogeton occidentalis Sieber ex Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton ochreatus Raoul | Accepted |  | WCSP |  | 
	
		| Potamogeton ochreatus f. latifolius A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton ochreatus var. latifolius Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton octandrus Poir. | Accepted |  | WCSP |  | 
	
		| Potamogeton octandrus var. asiaticus (A.Benn.) Tzvelev | Synonym |  | WCSP |  | 
	
		| Potamogeton octandrus var. limosellifolius (Maxim. ex Korsh.) Tzvelev | Synonym |  | WCSP |  | 
	
		| Potamogeton octandrus subsp. limosellifolius (Maxim. ex Korsh.) Vorosch. | Synonym |  | WCSP |  | 
	
		| Potamogeton octandrus var. minduhikimo (Makino) H. Hara | Synonym |  | TRO |  | 
	
		| Potamogeton octandrus var. mizuhikimo (Makino) H.Hara | Accepted |  | WCSP |  | 
	
		| Potamogeton octandrus subsp. octandrus | Synonym |  | WCSP |  | 
	
		| Potamogeton odontocarpus Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton oederi G.Mey. | Synonym |  | WCSP |  | 
	
		| Potamogeton ogdenii Hellq. & R.L.Hilton | Accepted |  | WCSP |  | 
	
		| Potamogeton × olivaceus Baagøe ex G.Fisch. | Accepted |  | WCSP |  | 
	
		| Potamogeton oppositifolius DC. | Synonym |  | WCSP |  | 
	
		| Potamogeton × orientalis Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton orientalis Hagstr. | Unresolved |  | TRO |  | 
	
		| Potamogeton orthorrhynchus Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton owaihiensis Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton oxyphyllus Miq. | Accepted |  | WCSP |  | 
	
		| Potamogeton oxyphyllus var. faurei A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton pallidior Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton pallidus Lojac. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton paludosus Bory ex Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton palustris Teesd. | Synonym |  | WCSP |  | 
	
		| Potamogeton pamiricus Baagøe | Synonym |  | WCSP |  | 
	
		| Potamogeton panormitanus Biv. | Synonym |  | WCSP |  | 
	
		| Potamogeton panormitanus var. major G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton panormitanus var. minor Biv. ex Guss. | Synonym |  | WCSP |  | 
	
		| Potamogeton panormitanus var. minor Biv. | Synonym |  | WCSP |  | 
	
		| Potamogeton papuanicus G.Wiegleb | Accepted |  | WCSP |  | 
	
		| Potamogeton paramoanus R.R.Haynes & Holm-Niels. | Accepted |  | WCSP |  | 
	
		| Potamogeton parmatus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton parnassiifolius Schrad. ex Mert. & W.D.J.Koch | Synonym |  | WCSP |  | 
	
		| Potamogeton parvifolius Buchenau | Synonym |  | WCSP |  | 
	
		| Potamogeton pauciflorus Lam. | Synonym |  | WCSP |  | 
	
		| Potamogeton pauciflorus Pursh [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton pauciflorus var. californicus Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton pauciflorus var. niagarensis (Tuck.) A.Gray | Synonym |  | WCSP |  | 
	
		| Potamogeton paucifolius Opiz | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus L. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus subsp. balatonicus (Gams) Soó | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. brachypus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. caespitosus Mert. & W.D.J.Koch ex Fieber | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus subsp. chakassiensis Kashina | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. coronatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. coronatus (Hagstr.) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. dichotomus Wallr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. dichotomus (Wallr.) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. diffusus Hagstr. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus subsp. filiformis (Pers.) Hook.f. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. flabellatus (Bab.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus subsp. flabellatus (Bab.) Hook.f. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. foliosus Mert. & W.D.J.Koch ex Fieber | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. geminatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. glaucescens Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. gracilis Kuzmin & Skvortsov | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. helveticus (G.Fisch.) Glück | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus subsp. helveticus (G.Fisch.) Bertsch & F.Bertsch | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. interruptus (Kit.) Asch. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. interruptus (Kit.) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. latifolius J.W.Robbins [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. latifolius G.Mey. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. marinus (L.) Roem. & Schult. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus subsp. mongolicus (A.Benn.) Volobaev | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. mongolicus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. potensus Wallr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. potensus (Wallr.) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. protensis Wallr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. ramosissimus Mert. & W.D.J.Koch ex Fieber | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. scoparius Wallr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. scoparius (Wallr.) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. setaceus (Roth) C.Hartm. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. striatus (Ruiz & Pav.) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. subdrupaceus G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. tenuis G.Mey. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. ungulatus Hagstr. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus subsp. vaginatus (Turcz.) Magnin | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. vaginatus (Turcz.) Asch. & Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. vulgaris Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus var. zosteraceus (Fr.) Casp. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. zosteraceus (Fr.) Almq. | Synonym |  | WCSP |  | 
	
		| Potamogeton pectinatus f. zosteroides G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton pedersenii Tur | Synonym |  | WCSP |  | 
	
		| Potamogeton pennsylvanicus Willd. ex Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton pennsylvanicus var. portoricensis Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton perfoliatus L. | Accepted |  | WCSP |  | 
	
		| Potamogeton perfoliatus var. bupleuroides (Fernald) Farw. | Synonym |  | WCSP |  | 
	
		| Potamogeton perfoliatus subsp. bupleuroides (Fernald) R.T.Clausen | Synonym |  | WCSP |  | 
	
		| Potamogeton perfoliatus subsp. bupleuroides (Fernald) Hultén | Synonym |  | TRO |  | 
	
		| Potamogeton perfoliatus var. lacustris Wallman | Synonym |  | WCSP |  | 
	
		| Potamogeton perfoliatus var. lanceolatus Blytt | Synonym |  | WCSP |  | 
	
		| Potamogeton perfoliatus var. mandshuriensis A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton perfoliatus var. minor F.M.Bailey | Synonym |  | WCSP |  | 
	
		| Potamogeton perfoliatus var. muelleri A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton perfoliatus subsp. perfoliatus | Synonym |  | TRO |  | 
	
		| Potamogeton perfoliatus var. perfoliatus | Synonym |  | TRO |  | 
	
		| Potamogeton perfoliatus subsp. richardsonii (A.Benn.) Hultén | Synonym |  | WCSP |  | 
	
		| Potamogeton perfoliatus var. richardsonii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton perfoliatus var. sachalinensis H.Lév. | Synonym |  | WCSP |  | 
	
		| Potamogeton perneglectus Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton × perplexus A.Benn. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton × perpygmaeus Hagstr. ex Druce | Synonym |  | WCSP |  | 
	
		| Potamogeton peruviana C.Presl | Synonym |  | WCSP |  | 
	
		| Potamogeton perversus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton petiolaris Raf. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton petiolaris C.Presl [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton petiolatus Wolfg. | Synonym |  | WCSP |  | 
	
		| Potamogeton phialae Post | Synonym |  | WCSP |  | 
	
		| Potamogeton × philippinensis A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton pinnatum Walter | Synonym |  | TRO |  | 
	
		| Potamogeton plantagineus Du Croz ex Roem. & Schult. | Synonym |  | WCSP |  | 
	
		| Potamogeton plantagineus var. jamaicensis Griseb. | Synonym |  | WCSP |  | 
	
		| Potamogeton plantago T.Bastard | Synonym |  | WCSP |  | 
	
		| Potamogeton × pleiophyllus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton polygonifolius Pourr. | Accepted |  | WCSP |  | 
	
		| Potamogeton polygonifolius var. amphibius (Fr.) Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton polygonifolius subsp. microcarpus (Boiss. & Reut.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton polygonifolius var. parnassiifolius (Schrad. ex Mert. & W.D.J.Koch) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton polygonifolius var. terrestris (Coss. & Germ.) Rouy | Synonym |  | WCSP |  | 
	
		| Potamogeton polygonus Cham. | Accepted |  | WCSP |  | 
	
		| Potamogeton porcatus Muhl. | Synonym |  | WCSP |  | 
	
		| Potamogeton porrigens Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton porsildiorum Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton porteri Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton praelongus Wulfen | Accepted |  | WCSP |  | 
	
		| Potamogeton × praelongus Bréb. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton praelongus F.Muell. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton praelongus f. praelongus | Synonym |  | TRO |  | 
	
		| Potamogeton praelongus f. pygmaeus Galinis | Synonym |  | WCSP |  | 
	
		| Potamogeton preussii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton promontoricus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton proteus Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton × prussicus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton × pseudofriesii Dandy & G.Taylor | Accepted |  | WCSP |  | 
	
		| Potamogeton × pseudolacunatus Papch. | Synonym |  | WCSP |  | 
	
		| Potamogeton pseudolongifolius Papch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × pseudolucens Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pseudopolygonus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × pseudosarmaticus Papch. | Accepted |  | WCSP |  | 
	
		| Potamogeton × pseudozizii Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pulchelliformis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pulcher Tuck. | Accepted |  | WCSP |  | 
	
		| Potamogeton pulcher f. amphibius Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pumilus Wolfg. | Synonym |  | WCSP |  | 
	
		| Potamogeton punense A. Galán | Accepted |  | TRO |  | 
	
		| Potamogeton punensis A.Galán | Synonym |  | WCSP |  | 
	
		| Potamogeton purpurascens Seidl ex J.Presl & C.Presl | Synonym |  | WCSP |  | 
	
		| Potamogeton purshii Tuck. ex Jennison | Synonym |  | WCSP |  | 
	
		| Potamogeton pusilliformis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus L. | Accepted |  | WCSP |  | 
	
		| Potamogeton pusillus var. acutus G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. africanus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus subsp. argentinus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. berchtoldii (Fieber) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. capitatus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. colpophilus Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. elongatus A.Benn. ex Macoun | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus subsp. flabellatus (Bab.) Hook.f. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus subsp. friesii (Rupr.) Hook.f. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus subsp. gemmiparus (J.W.Robbins) R.R.Haynes & Hellq. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. gemmiparus J.W.Robbins | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus subsp. groenlandicus (Hagstr.) Böcher | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. interruptus (Kit.) J.Presl & C.Presl | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. lacunatus Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. longipedunculatus Hicken | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. minor (Biv. ex Guss.) Fernald & B.G.Schub. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus subsp. mucronatus (Schrad. ex Sond.) Celak. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. mucronatus (Schrad. ex Sond.) Hook.f. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. mucronulatus G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. panormitanus (Biv.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. panormitanus (Biv.) Morong | Synonym |  | TRO |  | 
	
		| Potamogeton pusillus var. polyphyllus Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. pseudorutilus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. pusillus | Synonym |  | TRO |  | 
	
		| Potamogeton pusillus subsp. pusillus | Synonym |  | TRO |  | 
	
		| Potamogeton pusillus var. rutiloides (Fernald) B.Boivin | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. sphaerocarpus K.Schum. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus subsp. sturrockii (A.Benn.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. tenuifolius K.Schum. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus subsp. tenuissimus (Mert. & W.D.J.Koch) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus var. tenuissimus Mert. & W.D.J.Koch | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus f. tenuissimus (Mert. & W.D.J.Koch) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton pusillus subsp. tenuissimus (Mert. & W.D.J. Koch) R.R. Haynes & Hellq. | Synonym |  | TRO |  | 
	
		| Potamogeton quinquenervius Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton × raunkiaeri G.Escher | Synonym |  | WCSP |  | 
	
		| Potamogeton × rectifolius A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton recurvatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton reduncus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton reflexus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton reichenbachii M.Loehr ex Beurl. | Synonym |  | WCSP |  | 
	
		| Potamogeton reniacoensis Sparre | Accepted |  | WCSP |  | 
	
		| Potamogeton repens Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton reptans Humn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × rhodensis A.Benn. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton richardii Solms | Accepted |  | WCSP |  | 
	
		| Potamogeton richardsonii (A.Benn.) Rydb. | Accepted |  | WCSP |  | 
	
		| Potamogeton rigidus Wolfg. | Synonym |  | WCSP |  | 
	
		| Potamogeton × ripensis Baagøe | Accepted |  | WCSP |  | 
	
		| Potamogeton × rivularis Gillot | Accepted |  | WCSP |  | 
	
		| Potamogeton robbinsii Oakes | Accepted |  | WCSP |  | 
	
		| Potamogeton robbinsii f. cultellatus Fassett | Synonym |  | WCSP |  | 
	
		| Potamogeton robbinsii var. japonicus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton robbinsii f. robbinsii | Synonym |  | TRO |  | 
	
		| Potamogeton × roemeri F.J.Herm. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton rostratus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton rostratus var. humilis Volobaev | Synonym |  | WCSP |  | 
	
		| Potamogeton × rothii A.Benn. ex G.Fisch. [Invalid] | Synonym |  | WCSP |  | 
	
		| Potamogeton rotundatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton rotundifolius J.R.Forst. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton rotundifolius Schultz [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton roxburghianus Schult. & Schult.f. | Synonym |  | WCSP |  | 
	
		| Potamogeton rubricans Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton rubrinaevus Gand. | Synonym |  | WCSP |  | 
	
		| Potamogeton rufescens Schrad. | Synonym |  | WCSP |  | 
	
		| Potamogeton rufescens subsp. helodes (Dumort.) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton rufescens var. nerviger (Wolfg.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton rufescens subsp. nerviger (Wolfg.) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton rufescens subsp. nigrescens (Fr.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton rufescens subsp. rigidus (Wolfg.) K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton rufescens subsp. rivularis (Gillot) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton × rugelii A.Benn. [Invalid] | Synonym |  | WCSP |  | 
	
		| Potamogeton rutilus Wolfg. | Accepted |  | WCSP |  | 
	
		| Potamogeton rutilus (Humn.) Nyman | Synonym |  | TRO |  | 
	
		| Potamogeton rutilus subsp. caespitosus (Humn.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton rutilus var. grisebachii (Heuff.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton rutilus var. reptans (Humn.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton sachalinensis (H.Lév.) H.Lév. | Synonym |  | WCSP |  | 
	
		| Potamogeton × salicifolius Wolfg. | Accepted |  | WCSP |  | 
	
		| Potamogeton × salicifolius Wolfg. ex Schult. & Schult. f. | Synonym |  | TRO |  | 
	
		| Potamogeton salicifolius Wolfg. | Unresolved |  | TRO |  | 
	
		| Potamogeton samariformis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton sarmaticus Mäemets | Accepted |  | WCSP |  | 
	
		| Potamogeton × saxonicus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton × schreberi G.Fisch. | Accepted |  | WCSP |  | 
	
		| Potamogeton schweinfurthii A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton sclerocarpus K.Schum. | Accepted |  | WCSP |  | 
	
		| Potamogeton × scoliophyllus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton × scoliophyllus f. barensis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton seemenii Asch. & Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton semicoloratus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × semifructus A.Benn. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton semipellucidus W.D.J.Koch & Ziz | Synonym |  | WCSP |  | 
	
		| Potamogeton serotinus Schrad. ex Schult. & Schult.f. | Synonym |  | WCSP |  | 
	
		| Potamogeton serratus L. | Synonym |  | WCSP |  | 
	
		| Potamogeton serrulatus Opiz | Synonym |  | WCSP |  | 
	
		| Potamogeton serrulatus Regel & Maack [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton sessilifolius Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton setaceus L. | Synonym |  | WCSP |  | 
	
		| Potamogeton setaceus Schumach. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton sibiricus A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton sibiricus subsp. subsibiricus (Hagstr.) Tzvelev | Synonym |  | WCSP |  | 
	
		| Potamogeton siculus Bercht. & J.Presl | Synonym |  | WCSP |  | 
	
		| Potamogeton siculus Tineo ex Guss. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton similis A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton sinicus Migo | Synonym |  | WCSP |  | 
	
		| Potamogeton skvortsovii Klinkova | Accepted |  | WCSP |  | 
	
		| Potamogeton solomonensis G.Wiegleb | Accepted |  | WCSP |  | 
	
		| Potamogeton × sparganiifolius Laest. ex Fr. | Accepted |  | WCSP |  | 
	
		| Potamogeton sparganiifolius Bab. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton spathiformis Tuck. ex A.Gray | Synonym |  | WCSP |  | 
	
		| Potamogeton × spathulatus Schrad. ex W.D.J.Koch & Ziz | Accepted |  | WCSP |  | 
	
		| Potamogeton × spathulatus Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton spathuliformis (J.W. Robbins) Morong | Accepted |  | TRO |  | 
	
		| Potamogeton spirilliformis Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton spirillus Tuck. | Accepted |  | WCSP |  | 
	
		| Potamogeton spirillus var. curvifolius Peck | Synonym |  | WCSP |  | 
	
		| Potamogeton spoliatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton stagnorum Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton stenostachys K.Schum. | Accepted |  | WCSP |  | 
	
		| Potamogeton × steriliformis Hagstr. [Invalid] | Synonym |  | WCSP |  | 
	
		| Potamogeton × sterilis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × sterilis f. pernatans (G.Fisch.) Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton striatus Ruiz & Pav. | Synonym |  | WCSP |  | 
	
		| Potamogeton strictifolius A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton strictifolius var. rutiloides Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton strictifolius var. strictifolius | Synonym |  | TRO |  | 
	
		| Potamogeton strictifolius var. typicus Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton strictus Phil. | Synonym |  | WCSP |  | 
	
		| Potamogeton strictus var. magellanicus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton sturrockii Hook. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton sturrockii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton stylatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × subdentatus Hagstr. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton × subdentatus var. petiolatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × subdentatus var. sessilis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton subflavus Loret & Barrandon | Synonym |  | WCSP |  | 
	
		| Potamogeton subfuscus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton subjavanicus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton subnitens Hagstr. | Accepted |  | TRO |  | 
	
		| Potamogeton suboblongus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton subobtusus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton subretusus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton × subrufus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton subsessilifolius E.G.Camus | Synonym |  | WCSP |  | 
	
		| Potamogeton × subsessilis Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton subsibiricus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton subtrichodes Schur | Synonym |  | WCSP |  | 
	
		| Potamogeton × sudermanicus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton × suecicus K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton sulcatus A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton sumatranus Miq. | Accepted |  | WCSP |  | 
	
		| Potamogeton syriacus Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton tataricus Less. | Synonym |  | WCSP |  | 
	
		| Potamogeton teganumensis (Makino) Makino | Synonym |  | WCSP |  | 
	
		| Potamogeton tennesseensis Fernald | Accepted |  | WCSP |  | 
	
		| Potamogeton tenuicaulis F.Muell. | Synonym |  | WCSP |  | 
	
		| Potamogeton tenuifolius Raf. | Synonym |  | WCSP |  | 
	
		| Potamogeton tenuifolius Kunth [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton tenuifolius F.Phil. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton tenuifolius var. subellipticus Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton × tenuinervis E.G.Camus | Synonym |  | WCSP |  | 
	
		| Potamogeton tenuissimus M.Loehr ex Beurl. | Synonym |  | WCSP |  | 
	
		| Potamogeton tenuissimus Hook.f. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton tenuissimus (Mert. & W.D.J. Koch) Rchb. | Synonym |  | TRO |  | 
	
		| Potamogeton tepperi A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton thomasii A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton thunbergii Cham. & Schltdl. | Synonym |  | WCSP |  | 
	
		| Potamogeton × tiselii K.Richt. | Synonym |  | WCSP |  | 
	
		| Potamogeton tonkinensis E.G.Camus | Synonym |  | WCSP |  | 
	
		| Potamogeton torquatus Koidz. | Synonym |  | WCSP |  | 
	
		| Potamogeton × torssandrii (Tiselius) Dörfl. | Accepted |  | WCSP |  | 
	
		| Potamogeton tretocarpus Maxim. ex A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton tricarinatus F.Muell. & A.Benn. | Accepted |  | WCSP |  | 
	
		| Potamogeton trichoides Cham. & Schltdl. | Accepted |  | WCSP |  | 
	
		| Potamogeton trichoides Tuck. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton trichoides Benth. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton trichoides var. liocarpus Asch. | Synonym |  | WCSP |  | 
	
		| Potamogeton trichoides var. monogynus (J.Gay) Magnin | Synonym |  | WCSP |  | 
	
		| Potamogeton trichoides var. tuberculatus (Ten. & Guss.) Nyman | Synonym |  | WCSP |  | 
	
		| Potamogeton trichoides var. tuberculosus Rchb. | Synonym |  | WCSP |  | 
	
		| Potamogeton trinervius G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton tuberculatus Ten. & Guss. | Synonym |  | WCSP |  | 
	
		| Potamogeton tuberosus Roxb. | Synonym |  | WCSP |  | 
	
		| Potamogeton tubulatus Hagstr. | Accepted |  | WCSP |  | 
	
		| Potamogeton tuckermanii J.W.Robbins | Synonym |  | WCSP |  | 
	
		| Potamogeton turionifer Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton turionifer var. mucronulatus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton turionifer var. tenuis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton ulei K.Schum. | Accepted |  | WCSP |  | 
	
		| Potamogeton uliginosus Boenn. ex Cham. & Schlecht. | Synonym |  | WCSP |  | 
	
		| Potamogeton × undulatus Wolfg. | Accepted |  | WCSP |  | 
	
		| Potamogeton × undulatus var. cooperi Fryer | Synonym |  | WCSP |  | 
	
		| Potamogeton × upsaliensis Tiselius | Synonym |  | WCSP |  | 
	
		| Potamogeton uruguayensis A.Benn. & Graebn. | Accepted |  | WCSP |  | 
	
		| Potamogeton vaginalis J.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton × vaginans (Bojer ex A. Benn.) Hagstr. | Synonym |  | TRO |  | 
	
		| Potamogeton vaginatus Turcz. | Synonym |  | WCSP |  | 
	
		| Potamogeton vaginatus var. canadensis Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton vaginatus subsp. helveticus (G.Fisch.) Schinz & Thell. | Synonym |  | WCSP |  | 
	
		| Potamogeton vaginatus var. helveticus G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton vaginatus f. helveticus (G.Fisch.) G.Fisch. | Synonym |  | WCSP |  | 
	
		| Potamogeton vaillantii Roem. & Schult. | Synonym |  | WCSP |  | 
	
		| Potamogeton varians Morong ex Fryer | Synonym |  | WCSP |  | 
	
		| Potamogeton × variifolius Thore | Accepted |  | WCSP |  | 
	
		| Potamogeton vaseyi J.W.Robbins | Accepted |  | WCSP |  | 
	
		| Potamogeton vaseyi var. latifolius Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton venosus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × venustus Baagøe ex A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton × vepsicus A.A.Bobrov & Chemeris | Accepted |  | WCSP |  | 
	
		| Potamogeton × versicolor Z.Kaplan, Hellq. & Fehrer | Accepted |  | WCSP |  | 
	
		| Potamogeton verticillatum Walter | Unresolved |  | WCSP (in review) |  | 
	
		| Potamogeton × vilnensis Galinis. | Unresolved |  | TRO |  | 
	
		| Potamogeton volhynicus Besser ex Roem. & Schult. | Synonym |  | WCSP |  | 
	
		| Potamogeton wolfgangii Kihlm. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton wrightii Morong | Accepted |  | WCSP |  | 
	
		| Potamogeton × xinganensis Ma [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton × yamagataensis Kadono & Wiegleb | Accepted |  | WCSP |  | 
	
		| Potamogeton zetterstedtii Wallman | Synonym |  | WCSP |  | 
	
		| Potamogeton zizii Mert. & W.D.J.Koch | Synonym |  | WCSP |  | 
	
		| Potamogeton × zizii W.D.J.Koch ex Roth [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton zizii Koch ex Roth | Synonym |  | TRO |  | 
	
		| Potamogeton zizii var. connecticutensis (J.W.Robbins) Morong | Synonym |  | WCSP |  | 
	
		| Potamogeton zizii var. gracilis A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton zizii var. methyensis (A.Benn.) Graebn. | Synonym |  | WCSP |  | 
	
		| Potamogeton zizii var. porrectifolius A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton zizii f. pulcherrimus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton ziziiformis Hagstr. [Unplaced] | Unresolved |  | WCSP |  | 
	
		| Potamogeton zosteraceus Fr. | Synonym |  | WCSP |  | 
	
		| Potamogeton zosteraceus Bab. [Illegitimate] | Synonym |  | WCSP |  | 
	
		| Potamogeton zosterifolius Schumach. | Synonym |  | WCSP |  | 
	
		| Potamogeton zosterifolius var. americanus A.Benn. | Synonym |  | WCSP |  | 
	
		| Potamogeton zosterifolius var. minor Hook. | Synonym |  | WCSP |  | 
	
		| Potamogeton zosterifolius f. selenocarpus Hagstr. | Synonym |  | WCSP |  | 
	
		| Potamogeton zosterifolius subsp. zosteriformis (Fernald) Hultén | Synonym |  | WCSP |  | 
	
		| Potamogeton zosteriformis Fernald | Synonym |  | WCSP |  | 
	
		| Potamogeton zosterophyllus Dumort. | Synonym |  | WCSP |  |