| Name | Posidonia |
| Authorship | |
| Rank | Genus |
| NomenclaturalStatus | NomLeg |
| Placed in | Potamogetonaceae |
| Contains | Posidonia angustifolia Cambridge & J.Kuo Posidonia antarctica (Labill.) Spreng. Posidonia australis Hook.f. Posidonia caulini K.D.Koenig Posidonia coriacea Cambridge & J.Kuo Posidonia denhartogii J.Kuo & Cambridge Posidonia kirkmanii J.Kuo & Cambridge Posidonia oceania (L.) Delile Posidonia oceanica Delile Posidonia ostenfeldii Hartog Posidonia paradoxica J.-H.Li Posidonia robertsonae Kuo & Camb. Posidonia robertsoniae J.Kuo & Cambridge Posidonia serrulata (R.Br.) Spreng. Posidonia sinuosa Cambridge & J.Kuo Posidonia sp. Posidonia wuweiensis J.-H.Li Posidonia yinkengensis J.-H.Li |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Posidonia |
| Identification made in | [no date] (1) |