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CCDB → Pteridophytes → Salviniaceae → Azolla
| Taxon name | Status | Median (n) |
| Azolla caroliniana Willd. | Accepted | 22 |
| Azolla filiculoides Lam. | Accepted | 22 |
| Azolla filiculoides var. rubra (R. Br.) Strasb. | Accepted | 22 |
| Azolla mexicana C. Presl | Accepted | 22 |
| Azolla microphylla Kaulf. | Accepted | 22 |
| Azolla pinnata R. Br. | Accepted | 31 |
| Azolla pinnata subsp. africana (Desv.) R. M. K. Saunders & K. Fowler | Accepted | 22 |
| Azolla nilotica Mett. | Unresolved | 26 |
| Azolla caroliniana None | Synonym of Azolla caroliniana Willd. | 22 |
| Azolla rubra R. Br. | Synonym of Azolla filiculoides var. rubra (R. Br.) Strasb. | 22 |
| Azolla pinnata | Synonym of Azolla pinnata R. Br. | 31 |
| Azolla pinnata subsp. africana R. M. K. Saunders & K. Fowler | Synonym of Azolla pinnata subsp. africana (Desv.) R. M. K. Saunders & K. Fowler | 22 |