| Polygonum
amphibium var. emersum
Michaux. = P. coccineum Muhl. = Persicaria amphibia (L.) Gray erect water smartweed Native |
                      
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| Polygonum
amplexicaule
D. Don = Bistorta amplexicaulis (D. Don) Greene = Persicaria amplexicaulis (D.Don) Ronse Decr. mountain fleece, red bistort Introduced |
         
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| Polygonum
arifolium
L. = Persicaria arifolia (L.) Haroldson halberdleaf tearthumb Native |
                 
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| Polygonum
aviculare
L. = P. arenastrum Jordan ex Boreau doorweed Introduced |
                         
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| Polygonum
x bohemicum
= Fallopia x bohemica (Chrtek et Chrtkova) J.P. Balley = P. cuspidatum x P. sachalinense Bohemian knotweed Invasive |
                                   
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| Polygonum
careyi
Olney = Persicaria careyi (Olney) Greene Carey's smartweed Native |
                                      
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| Polygonum
cilinode
Michaux = Fallopia cilinodis (Michaux) Holub fringed bindweed Native |
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| Polygonum
convolvulus
L. = Fallopia convolvulus (L.) A. Love false buckwheat, black bindweed Introduced |
  
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| Polygonum
cristatum
Engelm. et A. Gray = Fallopia cristata (Engelm. et Gray) Holub winged bindweed Native |
         
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| Polygonum
cuspidatum
Sieb. et Zucc. = Fallopia japonica (Houtt.) L.P. Ronse Decraene = Reunoutria japonica Houtt. Japanese knotweed Invasive |
                                    
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| Polygonum
cuspidatum var. compactum
(Hook. f.) L.H. Bailey = P. compactum J. D. Hooker dwarf Japanese knotweed Invasive |
    
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| Polygonum
glaucum
Nutt. seaside knotweed Watch-Listed |
         
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| Polygonum
hydropiper
L. water-pepper Introduced |
     
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| Polygonum
hydropiperoides
Michaux = Persicaria hydropiperoides (Michaux) Small false water-pepper Native |
                           
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| Polygonum
lapathifolium
L. = Persicaria lapathifolia (L.) S.F. Gray nodding smartweed Native |
    
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| Polygonum
longisetum
Bruijn in F. A. W. Miquel = P. cespitosum var. longisetum (deBruyn) A.N.Steward = Persicaria longiseta (Bruyn) Kitagawa Chinese smartweed, bristly lady's thumb Introduced |
                   
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| Polygonum
pensylvanicum
L. = Persicaria pensylvanica (L.) G. Maza pinkweed Native |
                                  
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| Polygonum
perfoliatum
L. = Persicaria perfoliata (L.) H. Gross mile-a-minute Invasive |
                                      
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| Polygonum
persicaria
L. = Persicaria maculosa (L.) S.F. Gray lady's thumb Introduced |
                           
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| Polygonum
polystachyum
Wallich ex Meisner = Persicaria wallichii Greuter et Burdet = Reynoutria polystachya (Wallich ex Meisner) Moldenke Himalayan knotweed, garden smartweed Introduced |
             
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| Polygonum
punctatum
Ell. = Persicaria punctata (Ell.) Small dotted smartweed Native |
                       
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| Polygonum
puritanorum
Fern. = Persicaria puritanorum (Fern.) Sojak pondshore smartweed Special Concern |
                 
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| Polygonum
ramosissimum
Michaux saltmarsh knotweed Native |
            
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| Polygonum
robustius
(Small) Fern. = P. robustior (Small) Bicknell = P. punctatum var. majus (Meisner) Fassett big water-smartweed, coarse smartweed Native |
             
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| Polygonum
sachalinense
Schmidt ex Maxim. = Fallopia sachalinensis (F.S. Petrop. ex Maxim.) R.Decr. giant knotweed Invasive |
          
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| Polygonum
sagittatum
L. = Persicaria sagittata (L.) H. Gross arrowleaf tearthumb Native |
               
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| Polygonum
scandens
L. = Fallopia scandens (L.) Holub climbing false buckwheat Native |
                         
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| Polygonum
tenue
Michaux rock knotweed Watch-Listed |
           
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| Polygonum
virginianum
= Tovara virginiana (L.) Raf. = Persicaria virginiana (L.) Gaertner jumpseed Native |
                       
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