Polygonaceae
| Authority | : | Jussieu, 1789 |
| Nederlands | : | Duizendknoopfamilie |
| English | : | knotweed family, buckwheat family |
| Deutsch | : | Knöterichgewächse |
| Polygonum aviculare |
| Authority | : | Linnaeus, 1753 |
| Nederlands | : | gewoon varkensgras |
| English | : | common knotgrass |
| Deutsch | : | Ackervogelknöterich, verschiedenblättriger Vogelknöterich |
| Norsk | : | tungras |
| Svenska | : | stor trampört |
| Français | : | herbe à cochon, renouée des oiseaux, trainasse |
| Italiano | : | centinoda, correggiola, poligono centinodia, poligono comune, poligono degli uccelli |
| Español | : | corregüela de los caminos, hierba de las calanturas, hierba nudosa, hierba rastrera, lengua de pájaro, milnodia, polígono macho, sanguinaria mayor, saucejo, pasto del pollo |
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| Amstelveen, the Netherlands; 18 August 2021. | |
| Polygonum cf. equisetiforme |
| Authority | : | Smith, 1809 |
| English | : | horsetail knotgrass |
| Italiano | : | poligono equisetiforme |
| Español | : | centinodia, hierba de la sangre |
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| Potochnitsa (Kardzjali), Bulgaria; 25 June 2021. | |
| Polygonum maritimum |
| Authority | : | Linnaeus, 1753 |
| Nederlands | : | strandduizendknoop |
| English | : | sea knotgrass |
| Deutsch | : | Dünenknöterich, Meerknöterich |
| Français | : | renouée maritime |
| Italiano | : | poligono marittimo |
| Español | : | centinodia marítima, corregüela del mar, corregüela marina |
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| Korinthe (Peloponnesus), Greece; 10 April 2023. | |