Posidonia Totally Explained

Everything about Posidoniaceae totally explained

ť Pos(e)idonia also refers to the city of Magna Graecia later known as Paestum

Posidonia is a genus of flowering plants. It contains two to 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.

Diversity

This is a list of species that are nominally contained by the genus:

Posidonia angustifolia Cambridge and Kuo
Posidonia australis Hook.f. South coast of Australia.
Posidonia coriacea Cambridge and Kuo
Posidonia denhartogii Kuo and Cambridge
Posidonia kirkmanii Kuo and Cambridge
Posidonia oceanica (L.) Delile - This plant is endemic to the Mediterranean Sea, where it forms undersea meadows.
Posidonia ostenfeldii den Hartog
Posidonia robertsoniae Kuo and Cambridge
Posidonia sinuosa Cambridge and Kuo

The species described by Linnaeus, Posidonia oceanica, is found in the mediterranean, the rest are located around the southern coast of Australia. All the other species occur in Western Australia. This arrangement was divided into two complexes; the Posidonia australis and Posidonia ostenfeldii groups. Some species descriptions may only be regional characteristics, and may need further revision.

Further Information

Get more info on 'Posidoniaceae'.

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