Posidonia

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Genus of aquatic plants

title: "Posidonia" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["posidonia", "alismatales-genera", "taxa-named-by-charles-konig"] description: "Genus of aquatic plants" topic_path: "general/posidonia" source: "https://en.wikipedia.org/wiki/Posidonia" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Genus of aquatic plants ::

| fossil_range = |image = Posidonia oceanica (L).jpg |image_caption = Posidonia oceanica |parent_authority = Hutch. |taxon = Posidonia |authority = K.D.Koenig |type_species = Posidonia oceanica |type_species_authority = L. |range_map = Posidonia range map.png |range_map_caption = Posidonia distribution range |subdivision_ranks = Species |subdivision = See text |synonyms =

  • Aegle Dulac
  • Alga Boehm.
  • Caulinia DC., nom. illeg.
  • Kernera Willd., nom. illeg.
  • Posidonion St.-Lag., orth. var.
  • Taenidium Targ.Tozz. |synonyms_ref =

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 oceanica has nitrogen fixation capabilities via symbiosis and other species may as well.

Species

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

The species described by Linnaeus, Posidonia oceanica, is found in the Mediterranean; the rest are located around the southern coast of Australia. Some species are endemic seagrasses of Western Australia, all the Australian species are found in that region's diverse habitats. 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.

In 2006 a clonal colony of P. oceanica was discovered south of the island of Ibiza which measured 8 km across and is possibly up to 100,000 years old.

Taxonomy

References

References

  1. (2011-01-17). "Evolutionary history of the seagrass genus Posidonia". Inter-Research Science Center.
  2. Angiosperm Phylogeny Group. (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society.
  3. "''Posidonia'' K.D.Koenig". [[Royal Botanic Gardens, Kew]].
  4. (2016). "The number of known plants species in the world and its annual increase". Magnolia Press.
  5. [http://www.mobot.org/MOBOT/Research/APweb/orders/alismatalesweb.htm#Alismatales AP-Website]
  6. (3 November 2021). "Terrestrial-type nitrogen-fixing symbiosis between seagrass and a marine bacterium". [[Nature (journal).
  7. Mike van Keulen. "The genus ''Posidonia'' König (''nom. cons.'') (Posidoniaceae).". [[Murdoch University]].
  8. Cambridge, M.L. and Kuo, J. (1979) Two new species of seagrass from Australia, ''Posidonia sinuosa'' and ''Posidonia angustifolia'' (Posidoniaceae). ''Aquat. Bot. ''6, 307–328 ''f.'' Keulen
  9. Kuo, J. and Cambridge, M.L. (1984) A taxonomic study of the ''Posidonia ostenfeldii'' complex (Posidoniaceae) with descriptions of four new Australian seagrasses. ''Aquat. Bot. ''20, 267–95. ''f.'' Keulen
  10. den Hartog, C. (1970) Seagrasses of the World. ''Verh. Kon. Ned. Akad. Wetens. Afd. Naturk. Ser. 2 ''59:139 ''f.'' Keulen
  11. Kuo, J. and McComb, A.J. (1989) In: "Biology of Seagrasses. A treatise on the biology of seagrasses with special reference to the Australian region." (Eds. A.W.D. Larkum, A.J. McComb, S.A. Shepherd) (Aquatic Plant Studies 2) (Elsevier, Amsteredam). p. 6-73 ''f.'' Keulen
  12. Campey, M.L.. (January 2000). "Re-evaluating species boundaries among members of the Posidonia ostenfeldii species complex (Posidoniaceae) – morphological and genetic variation". Aquatic Botany.
  13. Ibiza Spotlight. (28 May 2006). "Ibiza's Monster Marine Plant".

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