• Polygonum Blainville, 1826 (unaccepted) [Family: Fasciolariidae]
• Polygonum Linnaeus, 1753 [Family: Polygonaceae]
• Polygonum achoreum Blake
• Polygonum acre Kunth accepted as Polygonum punctatum Ell.
• Polygonum acuminata H.B.K.
• Polygonum acuminatum Kunth
• Polygonum aequale Lindm. accepted as Polygonum arenastrum Jord. ex Boreau
• Polygonum alaskanum W. Wight ex Hultén accepted as Polygonum alpinum All.
• Polygonum alatum Hamilton ex D. Don accepted as Polygonum nepalense Meisn.
• Polygonum allocarpum Blake accepted as Polygonum ramosissimum Michx.
• Polygonum alpinum All.
• Polygonum amphibium Linnaeus
• Polygonum arenarium Waldst. & Kit.
• Polygonum arenastrum Jord. ex Boreau
• Polygonum argyrocoleon Steud. ex Kunze
• Polygonum arifolium Linnaeus
• Polygonum articulatum Linnaeus accepted as Polygonella articulata (L.) Meisn.
• Polygonum atlanticum (B.L. Robins.) Bickn.p.p. accepted as Polygonum ramosissimum Michx.
• Polygonum aubertii Henry
• Polygonum austiniae Greene accepted as Polygonum douglasii Greene
• Polygonum autumnale Brenckle accepted as Polygonum ramosissimum Michx.
• Polygonum aviculare Linnaeus
• Polygonum baldschuanicum Regel
• Polygonum bellardii All.
• Polygonum bellardii auct. non All. accepted as Polygonum patulum Bieb.
• Polygonum beyrichianum Cham. & Schlecht. accepted as Polygonum meisnerianum Cham. & Schlecht.
• Polygonum bicorne Raf. accepted as Polygonum pensylvanicum Linnaeus
• Polygonum bidwelliae S. Wats.
• Polygonum bistorta Linnaeus
• Polygonum bistortoides Pursh
• Polygonum bolanderi Brewer
• Polygonum bolanderi W. Brew.
• Polygonum boreale (Lange) Small
• Polygonum brasiliensis K. Koch.
• Polygonum braziliense K. Koch accepted as Polygonum striatulum B.L. Robins.
• Polygonum bungeanum Turcz.
• Polygonum buxifolium Nutt. ex Bong. accepted as Polygonum fowleri B.L. Robins.
• Polygonum buxiforme Small
• Polygonum caespitosum Blume
• Polygonum californicum Meisn.
• Polygonum campanulatum Hook. f.
• Polygonum camporum Meisn. accepted as Polygonum striatulum B.L. Robins.
• Polygonum capitatum Buch.-Ham. ex D. Don
• Polygonum careyi Olney
• Polygonum cascadense W.H. Baker
• Polygonum caurianum B.L. Robins.
• Polygonum cephalophorum Greene accepted as Polygonum bistortoides Pursh
• Polygonum cespitosum Blume accepted as Polygonum caespitosum Blume
• Polygonum chinense Linnaeus
• Polygonum cilinode Michx.
• Polygonum coccineum Muhl. ex Willd. accepted as Polygonum amphibium Linnaeus
• Polygonum confertiflorum Nutt. ex Piper accepted as Polygonum polygaloides Wallich ex Meisn.
• Polygonum convolvulus Linnaeus
• Polygonum cristatum Engelm. & Gray accepted as Polygonum scandens Linnaeus
• Polygonum cuspidatum Sieb. & Zucc.
• Polygonum davisiae Brewer ex Gray
• Polygonum densiflorum Meisn.
• Polygonum douglasii Greene
• Polygonum dubium Stein accepted as Polygonum persicaria Linnaeus
• Polygonum dumetorum Linnaeus accepted as Polygonum scandens Linnaeus
• Polygonum emaciatum A. Nels. accepted as Polygonum douglasii Greene
• Polygonum engelmannii Greene accepted as Polygonum douglasii Greene
• Polygonum erectum Linnaeus
• Polygonum esotericum L.C. Wheeler accepted as Polygonum polygaloides Wallich ex Meisn.
• Polygonum exsertum auct.p.p. non Small accepted as Polygonum ramosissimum Michx.
• Polygonum fagopyrum Linnaeus accepted as Fagopyrum esculentum Moench
• Polygonum fimbriatum Ell. accepted as Polygonella fimbriata (Ell.) Horton
• Polygonum fluitans Eat. accepted as Polygonum amphibium Linnaeus
• Polygonum fowleri B.L. Robins.
• Polygonum franktonii S.J. Wolf & McNeill
• Polygonum fugax Small accepted as Polygonum viviparum Linnaeus
• Polygonum fusiforme Greene accepted as Polygonum persicaria Linnaeus
• Polygonum glabrum sensu Cham. & Schlecht., non Willd. accepted as Polygonum densiflorum Meisn.
• Polygonum glastifolium Greene accepted as Polygonum bistortoides Pursh
• Polygonum glaucum Nutt.
• Polygonum gracile Nutt. accepted as Polygonella gracilis Meisn.
• Polygonum greenii S. Wats. accepted as Polygonum californicum Meisn.
• Polygonum hartwrightii Gray accepted as Polygonum amphibium Linnaeus
• Polygonum herniarioides Delile
• Polygonum heterophyllum Lindl. accepted as Polygonum aviculare Linnaeus
• Polygonum heterosepalum M.E. Peck & Ownbey
• Polygonum hickmanii H. Hinds & R. Morgan
• Polygonum hirsutum Walt.
• Polygonum hudsonianum (S.J. Wolf & McNeill) H. Hinds
• Polygonum humifusum Pallas accepted as Polygonum caurianum B.L. Robins.
• Polygonum hydropiper Linnaeus
• Polygonum hydropiperoides Michx.
• Polygonum imbricatum Nutt. accepted as Polygonum polygaloides Wallich ex Meisn.
• Polygonum incanum F.W. Schmidt accepted as Polygonum lapathifolium Linnaeus
• Polygonum incarnatum Ell. accepted as Polygonum lapathifolium Linnaeus
• Polygonum interius Brenckle accepted as Polygonum ramosissimum Michx.
• Polygonum inundatum Raf. accepted as Polygonum amphibium Linnaeus
• Polygonum kelloggii Greene accepted as Polygonum polygaloides Wallich ex Meisn.
• Polygonum lacerum Kunth
• Polygonum lapathifolium Linnaeus
• Polygonum leptocarpum B.L. Robins.
• Polygonum littorale Link accepted as Polygonum buxiforme Small
• Polygonum longisetum de Bruyn accepted as Polygonum caespitosum Blume
• Polygonum longistylum Small accepted as Polygonum pensylvanicum Linnaeus
• Polygonum macounii Small ex Macoun accepted as Polygonum viviparum Linnaeus