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CCDB → Angiosperms → Alismataceae → Helanthium
| Taxon name | Status | Median (n) |
| Echinodorus bolivianus (Rusby) Holm-Niels. | Synonym of Helanthium bolivianum (Rusby) Lehtonen & Myllys | 11 |
| Echinodorus latifolius (Seub.) Rataj | Synonym of Helanthium bolivianum (Rusby) Lehtonen & Myllys | 11 |
| Echinodorus tenellus (Mart.) Buchenau | Synonym of Helanthium tenellum (Mart.) J. G. Sm. | 11 |