| Persicaria palmae J.J. Ancona & J.J. Ortiz-Díaz, 2025 |
| Persicaria pensylvanica (L.) M. Gómez, 1896 |
| Persicaria persicarioides Small, 1903 |
| Persicaria pringlei (Small) J.J. Ancona & J.J. Ortiz-Díaz, 2025 |
| Persicaria punctata (Elliott) Small, 1903 |
| Persicaria segetum (Kunth) Small, 1903 |
| Persicaria setacea (Baldwin) Small, 1903 |
| Persicaria veracruzana J.J. Ancona & J.J. Ortiz-Díaz, 2025 |
| Persicaria virginiana (L.) Gaertn., 1790 |
| Podopterus Bonpl., 1812 |
| Podopterus cordifolius Rose & Standl., 1920 |
| Podopterus guatemalensis S.F. Blake, 1921 |
| Podopterus mexicanus Bonpl., 1812 |
| Polygonaceae Juss., 1789 |
| Polygonoideae Eaton, 1836 |
| Polygonum L., 1753 |
| Polygonum acre Lam., 1778 |
| Polygonum acuminatum Kunth, 1818 |
| Polygonum amphibium L., 1753 |
| Polygonum amphibium var. emersum Michx., 1803 |