| Species | Species code | Content |
| affinis (D. Don) Ronse Decr. | |
| alpina (All.) H. Gross | |
| alpina × weyrichii = P. × fennica (Reiersen) Stace | |
| amphibia (L.) Delarbre | |
| amplexicaulis (D. Don) Ronse Decr. | |
| arifolia (L.) Haraldson | |
| bistorta (L.) Samp. | |
| bungeana (Turcz.) Nakai | |
| campanulata (Hook. f.) Ronse Decr. | |
| capitata (Buch.-Ham. ex D. Don) H. Gross | |
| glabra (Willd.) M. Gómez | |
| hydropiper (L.) Delarbre | |
| hydropiper × minor = P. × subglandulosa (Borbás) Soják | |
| hydropiper × mitis = P. × hybrida (Chaub. ex St.-Amans) Soják | |
| lapathifolia (L.) Delarbre | |
| lapathifolia × hydropiper = P. × figertii (Beck) Soják | |
| maculosa Gray | |
| maculosa × hydropiper = P. × intercedens (Beck) Soják | |
| maculosa × lapathifolia = P. × pseudolapathum (Schur) D.H. Kent | |
| maculosa × minor = P. × brauniana (F.W. Schultz) Soják | |
| maculosa × mitis = P. × condensata (F.W. Schultz) Soják | |
| minor (Huds.) Opiz | |
| mitis (Schrank) Assenov | |
| mitis × minor = P. × wilmsii (Beck) Soják | |
| mollis (D. Don) H. Gross | |
| nepalensis (Meisn.) H. Gross | |
| orientale (L.) Vilm. | |
| pensylvanica (L.) M. Gómez | |
| sagittata (L.) H. Gross ex Nakai | |
| senegalensis (L.) H. Gross ex Nakai | |
| vivipara (L.) Ronse Decr. | |
| wallichii Greuter & Burdet | |
| weyrichii (F. Schmidt) Ronse Decr. | |