| Polygonum portoricense Bertero ex Endl., 1848 |
| Polygonum pringlei Small, 1892 |
| Polygonum punctatum Elliott, 1817 |
| Polygonum punctatum var. eciliatum Small, 1893 |
| Polygonum punctatum var. ellipticum Fassett, 1949 |
| Polygonum punctatum var. punctatum Elliott, 1817 |
| Polygonum quadrangulatum M. Martens & Galeotti, 1843 |
| Polygonum scandens L., 1753 |
| Polygonum segetum Kunth, 1818 |
| Polygonum segetum var. verrucosum Stanford, 1925 |
| Polygonum tamnifolium Kunth, 1817 |
| Polygonum uvifera L., 1753 |
| Polygonum virginianum L., 1753 |
| Polygonum viridiflorum Poir., 1804 |
| Pterogonum H. Gross, 1913 |
| Pterogonum atrorubens Engelm., 1913 |
| Pterostegia Fisch. & C.A. Mey., 1836 |
| Pterostegia drymarioides Fisch. & C.A. Mey., 1836 |
| Reynoutria Houtt., 1777 |
| Reynoutria japonica Houtt., 1777 |