What is "posidonia"

Posidonia is a genus of flowering plants. It contains nine species of marine plants ) (" seagrass"), found in the seas of the Mediterranean and around the south coast of Australia.

The APG system (1998) and APG II system (2003) accept this genus as constituting the sole genus in the family Posidoniaceae, which it places in the order Alismatales, in the clade monocots. The AP-Website concludes that the three families Cymodoceaceae, Posidoniaceae and Ruppiaceae form a monophyletic group. Earlier systems classified this genus in the family Potamogetonaceae or in the family Posidoniaceae but belonging to order Zosterales.

Posidonia is a genus of seagrasses.

"Posidonia" may also refer to:

• Paestum, a Greek city in Italy, sometimes called "Posidonia" or "Poseidonia"
• Poseidonia or Posidonia, a village on the island of Syros (Greece)
• Posidonia Shale, a geological formation from the Lower Jurassic

Posidonia are an Italian progressive pop band from Turin, formed in 2012 in Turin, Italy.