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CCDB → Angiosperms → Philydraceae → Helmholtzia
| Taxon name | Status | Median (n) |
| Helmholtzia acorifolia F. Muell. | Accepted | 17 |
| Helmholtzia glaberrima (Hook.) Caruel | Accepted | 16 |
| Orthothylax glaberrimus (Hook.) Skottsb. | Synonym of Helmholtzia glaberrima (Hook.) Caruel | 16 |