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CCDB → Angiosperms → Rubiaceae → Hydnophytum
| Taxon name | Status | Median (n) |
| Hydnophytum formicarum Jack | Accepted | 22 |
| Hydnophytum longiflorum A. Gray | Accepted | 20 |
| Hydnophytum formicarum (Spreng.) Jack | Synonym of Hydnophytum formicarum Jack | 22 |
| Hydnophytum moseleyanum | Synonym of Hydnophytum moseleyanum Becc. | None |