| Name | Loudonia |
| Authorship | |
| Rank | Genus |
| NomenclaturalStatus | NomLeg |
| Placed in | Haloragaceae |
| Contains | Loudonia aurea Lindl. Loudonia behrii Schltdl. Loudonia cordigera (Fenzl) Hereman Loudonia flavescens J.Drumm. Loudonia roei (Endl.) Schltdl. Loudonia scoparia (Fenzl) Hereman Loudonia sp. |