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CCDB → Angiosperms → Boraginaceae → Hydrophyllum
| Taxon name | Status | Median (n) |
| Hydrophyllum appendiculatum Michx. | Accepted | 9 |
| Hydrophyllum canadense L. | Accepted | 9 |
| Hydrophyllum capitatum Douglas ex Benth. | Accepted | 9 |
| Hydrophyllum capitatum var. thompsonii (M. Peck) Constance | Accepted | 9 |
| Hydrophyllum fendleri var. albifrons (A. Heller) J. F. Macbr. | Accepted | 9 |
| Hydrophyllum macrophyllum Nutt. | Accepted | 9 |
| Hydrophyllum occidentale (S. Watson) A. Gray | Accepted | 9 |
| Hydrophyllum tenuipes A. Heller | Accepted | 9 |
| Hydrophyllum virginianum L. | Accepted | 9 |
| Hydrophyllum appendiculatum Michaux | Synonym of Hydrophyllum appendiculatum Michx. | 9 |
| Hydrophyllum capitatum var. capitatum | Synonym of Hydrophyllum capitatum Douglas ex Benth. | 9 |
| Hydrophyllum fendleri (A. Gray) Beller | Synonym of Hydrophyllum fendleri (A. Gray) A. Heller | 9 |
| Hydrophyllum fendleri var. fendleri | Synonym of Hydrophyllum fendleri (A. Gray) A. Heller | 9 |