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CCDB → Angiosperms → Araceae → Lemna
| Taxon name | Status | Median (n) |
| Lemna aequinoctialis Welw. | Accepted | 25 |
| Lemna disperma Hegelm. | Accepted | 20 |
| Lemna gibba L. | Accepted | 25 |
| Lemna japonica Landolt | Accepted | 20 |
| Lemna minor L. | Accepted | 20 |
| Lemna minuta Kunth | Accepted | 20 |
| Lemna obscura (Austin) Daubs | Accepted | 20 |
| Lemna perpusilla Torr. | Accepted | 20 |
| Lemna trisulca L. | Accepted | 22 |
| Lemna turionifera Landolt | Accepted | 21 |
| Lemna valdiviana Phil. | Accepted | 20 |
| Lemna aoukikusa T. Beppu & Murata | Synonym of Lemna aequinoctialis Welw. | 25 |
| Lemna aoukikusa subsp. hokurikuensis T. Beppu & Murata | Synonym of Lemna aequinoctialis Welw. | 25 |
| Lemna paucicostata Hegelm. | Synonym of Lemna aequinoctialis Welw. | 25 |
| Lemna minuscula Herter | Synonym of Lemna minuta Kunth | 20 |
| Lemna polyrrhiza L. | Synonym of Spirodela polyrrhiza (L.) Schleid. | 20 |