| Polygonum aviculare subsp. depressum (Meisn.) Arcang., 1882 |
| Polygonum aviculare subsp. neglectum (Besser) Arcang., 1882 |
| Polygonum barbatum Walter, 1788 |
| Polygonum beyrichianum Cham. & Schltdl., 1828 |
| Polygonum capitatum Buch.-Ham. ex D. Don, 1825 |
| Polygonum convolvulus L., 1753 |
| Polygonum douglasii Greene, 1885 |
| Polygonum ferrugineum Wedd., 1849 |
| Polygonum flexuosum Benth., 1839 |
| Polygonum glabrum Cham. & Schltdl., 1828 |
| Polygonum guatemalense Gand., 1919 |
| Polygonum hispidum Kunth, 1818 |
| Polygonum hydropiper L., 1753 |
| Polygonum hydropiperoides Michx., 1803 |
| Polygonum hydropiperoides var. hydropiperoides Michx., 1803 |
| Polygonum lapathifolium L., 1753 |
| Polygonum longiocreatum Bartlett, 1907 |
| Polygonum meisnerianum Cham. & Schltdl., 1828 |
| Polygonum meisnerianum var. beyrichianum (Cham. & Schltdl.) Meisn., 1855 |
| Polygonum meisnerianum var. jalapense B.L. Rob., 1900 |