- Lemna aequinoctialis, Common Duckweed
- Lemna biperforata
- Lemna disperma, Common Duck-weed
- Lemna gibba, Fat Duckweed
- Lemna minima
- Lemna minor, Common Duckweed
- Lemna minuta, Least Duckweed
- Lemna obscura, Little duckweed
- Lemna paucicostata, Water lentil
- Lemna perpusilla, Minute duckweed
- Lemna tenera
- Lemna trisulca, Ivy-leaved Duckweed
- Lemna turionifera, Turion duckweed
- Lemna valdiviana, Valdivia duckweed
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