| | Lagarosiphon - madagascariensis, major |
| |
 | Lagenandra - meeboldii |
| |
 | Landoltia - punctata |
| |
 | Lemna - minor, perpusilla, trisulca, turionifera, valdiviana |
| |
 | Leptodictyum - riparium |
| |
 | Lilaeopsis - attenuata, brasiliensis, carolinensis, mauritiana, novae-zelandiae |
| |
 | Limnobium - laevigatum, spongia, stoloniferum |
| |
 | Limnophila - aquatica, aromatica, aromatica 'Mini', hippuridoides, rugosa, sessiliflora |
| |
 | Limosella - aquatica |
| |
 | Lindernia - rotundifolia |
| |
 | Littorella - uniflora |
| |
 | Lobelia - cardinalis, cardinalis 'mini' |
| |
 | Lomariopsis - lineata |
| |
 | Lophocolea - sp. |
| |
 | Ludwigia - arcuata, brevipes, glandulosa, helminthorrhiza, inclinata, inclinata var. Curly, inclinata var. verticillata 'Cuba', inclinata var. verticillata 'Meta', inclinata var. verticillata 'Pantanal', Inclinata sp. 'White', mullertii, ovalis, palustris, peruensis, peruviana, pilosa, polycarpa, repens, repens 'Rubin', sedioides, sp. 'Atlantis', sp. 'Mini Super Red', sp. 'Mexico' |
| |
 | Lycopus - europaeus |
| |
 | Lysichiton - camtschatcensis |
| |
 | Lysimachia - aquatica, nummularia, nummularia 'Aurea', thyrsiflora |
| |
 | Lythrum - salicaria |
| |