| potamogeton gramineus x potamogeton nodosus | | USA: Maine | | 326348720 |
| potamogeton gramineus x potamogeton nodosus | | USA: Maine | | 326348787 |
| potamogeton gramineus x potamogeton nodosus | | USA: Maine | | 326348788 |
| potamogeton gramineus x potamogeton nodosus | | USA: Maine | | 326348789 |