- Polygonum achoreum, Leathery knotweed
- Polygonum acuminatum, Tapertip smartweed
- Polygonum affine, Himalayan Bistort
- Polygonum allocarpum
- Polygonum alpinum, Alaska wild rhubarb
- Polygonum amphibium, Amphibious Bistort
- Polygonum arenarium, Lesser Red-knotgrass
- Polygonum arenastrum, Small-leaved Knotgrass
- Polygonum argyrocoleon, Silversheath knotweed
- Polygonum argyrocoleum
- Polygonum arifolium, Halberd-leaved Tear-thumb
- Polygonum austiniae
- Polygonum aviculare, Wireweed
- Polygonum baldschuanicum, Russian-vine
- Polygonum barbatum
- Polygonum bellardii, Tree Hogweed
- Polygonum bidwelliae, Bidwells knotweed
- Polygonum bistorta, Meadow bistort
- Polygonum bistortoides, American bistort
- Polygonum bohemica
- Polygonum bolanderi, Bolanders knotweed
- Polygonum boreale, Northern Knotgrass
- Polygonum bungeanum, Persicaria bungeana
- Polygonum buxiforme, Box knotweed
- Polygonum californicum, California knotweed
- Polygonum campanulatum, Bellflower smartweed
- Polygonum capitatum, Pink-headed Persicaria
- Polygonum careyi, Careys smartweed
- Polygonum cascadense, Cascade knotweed
- Polygonum caurianum, Alaska knotweed
- Polygonum cespitosum, Oriental ladys thumb
- Polygonum chinense, Chinese knotweed
- Polygonum cilinode, Fringed black bindweed
- Polygonum coccineum
- Polygonum cognatum, Indian Knotgrass
- Polygonum confertiflorum
- Polygonum conspicuum
- Polygonum convolvulus, Black Bindweed
- Polygonum corrigioloides
- Polygonum cristatum
- Polygonum cuspidatum, Japanese Knotweed
- Polygonum davisiae, Davis knotweed
- Polygonum dichotomum
| - Polygonum douglasii, Douglas knotweed
- Polygonum engelmannii
- Polygonum equisetiforme
- Polygonum erectum, Erect knotweed
- Polygonum esotericum
- Polygonum exsertum
- Polygonum ferrugineum
- Polygonum filicaule
- Polygonum foliosum
- Polygonum fowleri, Fowlers knotweed
- Polygonum franktonii
- Polygonum glabrum, Persicaria glabra
- Polygonum glaucum, Sea Knotgrass
- Polygonum graminifolium
- Polygonum hastatosagittatum
- Polygonum heterosepalum, Oddsepal knotweed
- Polygonum hirsutum, Hairy Smartweed
- Polygonum hispidum
- Polygonum hydropiper, Water-pepper
- Polygonum hydropiperoides, Swamp smartweed
- Polygonum japonicum
- Polygonum kelloggii
- Polygonum lanatum
- Polygonum lapathifolium, Pale Persicaria
- Polygonum leptocarpum, Narrowpoint knotweed
- Polygonum longisetum
- Polygonum maackianum
- Polygonum majus
- Polygonum marinense, Marin knotweed
- Polygonum meisnerianum, Branched tearthumb
- Polygonum meisnerianum_beyrichianum, Persicaria meisneriana
- Polygonum micranthum
- Polygonum minimum, Broadleaf knotweed
- Polygonum minus, Small Water-pepper
- Polygonum molle, Soft Knotweed
- Polygonum multiflorum, Tuber fleeceflower
- Polygonum muricatum
- Polygonum natans
- Polygonum nepalense, Nepalese smartweed
- Polygonum nuttallii
- Polygonum orientale, Kiss me over the garden gate
- Polygonum oxyspermum, Rays Knotgrass
- Polygonum paronychia, Beach knotweed
| - Polygonum parryi, Parrys knotweed
- Polygonum patulum, Red-knotgrass
- Polygonum pensylvanica, Pennsylvania knotweed
- Polygonum pensylvanicum, Pinkweed
- Polygonum perfoliatum, Mile-a-minute Weed
- Polygonum persicaria, Redshank
- Polygonum phytolaccifolium, Poke knotweed
- Polygonum pilushanense
- Polygonum plebeium, Small Knotweed
- Polygonum polycnemoides, Manyleg knotweed
- Polygonum polygaloides, Milkwort knotweed
- Polygonum polystachyum, Cultivated knotweed
- Polygonum praetermissum
- Polygonum prolificum
- Polygonum pubescens
- Polygonum pulchrum
- Polygonum punctatum, Dotted smartweed
- Polygonum raii, Rays knotweed
- Polygonum ramosissimum, Bushy knotweed
- Polygonum robustius, Stout smartweed
- Polygonum runcinatum
- Polygonum sachalinense, Giant Knotweed
- Polygonum sagittatum, American Tear-thumb
- Polygonum sawatchense
- Polygonum scabrum
- Polygonum scandens, Climbing false buckwheat
- Polygonum segetum, Field smartweed
- Polygonum senticosum
- Polygonum setaceum, Bog smartweed
- Polygonum shastense, Shasta knotweed
- Polygonum spergulariiforme
- Polygonum striatulum, Striped knotweed
- Polygonum tenue, Pleatleaf knotweed
- Polygonum thunbergii, Knotweed
- Polygonum trigonocarpum
- Polygonum tripterocarpum
- Polygonum virginatum
- Polygonum virginianum, Jumpseed
- Polygonum viscosum
- Polygonum viviparum, Alpine Bistort
- Polygonum watsonii
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