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From Wikipedia, the free encyclopedia

Avicennia
Avicennia germinans
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Acanthaceae
Subfamily: Avicennioideae
Miers
Genus: Avicennia
L.[1]
Species

See text

Synonyms

Sceura Forssk.[1]

Avicennia is a genus of flowering plants currently placed in the bear's breeches family, Acanthaceae. It contains mangrove trees, which occur in the intertidal zones of estuarine areas and are characterized by its "pencil roots", which are aerial roots. They are also commonly known as api api, which in the Malay language means "fires", a reference to the fact that fireflies often congregate on these trees.[2] Species of Avicennia occur worldwide south of the Tropic of Cancer.

The taxonomic placement of Avicennia is contentious. In some classifications, it has been placed in the family Verbenaceae, but more recently has been placed by some botanists in the monogeneric family Avicenniaceae. Recent phylogenetic studies have suggested that Avicennia is derived from within Acanthaceae, and the genus is included in that family in the Angiosperm Phylogeny Group system.

Designation of species is made difficult by the great variations in form of Avicennia marina. Between eight and 10 species are usually recognised, with A. marina further divided into a number of subspecies.

The generic name honours Persian physician Avicenna (980-1037).[3]

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Transcription

Description

Members of the genus are among the most salt-tolerant mangroves and are often the first to colonise new deposits of sediment. The sap is salty, and excess salt is secreted through the leaves. The spreading root system provides stability in shifting substrates. Vertical roots called pneumatophores project from the mud, thus the term "pencil roots". These are used in gas exchange as very little oxygen is available in the mud. The flowers are fragrant and rich in nectar, and are pollinated by insects. The embryos exhibit cryptovivipary, a process where they start to develop before the seed is shed, but do not break through the outside of the fruit capsule.[4]

List of species

Eight species are currently accepted:[5]

Propagule of Avicennia sp.


References

  1. ^ a b "Genus: Avicennia L." Germplasm Resources Information Network. United States Department of Agriculture. 2006-03-30. Retrieved 2010-05-26.
  2. ^ Api-api Putih (Avicennia alba) The Tide Chaser. Retrieved 2012-02-08.
  3. ^ Quattrocchi, Umberto (2000). CRC World Dictionary of Plant Names. Vol. 1 A-C. CRC Press. p. 242. ISBN 978-0-8493-2675-2.
  4. ^ Api Api Mangrove and wetland wildlife at Sungei Buloh Nature Park. Retrieved 2012-02-08,
  5. ^ Avicennia L. Plants of the World Online, Kew Science. Accessed 19 March 2023.
  6. ^ "Avicennia balanophora Stapf & Moldenke — The Plant List". www.theplantlist.org.
  7. ^ "Avicennia bicolor Standl. — The Plant List". www.theplantlist.org.
  8. ^ "Avicennia germinans (L.) L. — The Plant List". www.theplantlist.org.
  9. ^ "Avicennia integra N.C.Duke — The Plant List". www.theplantlist.org.
  10. ^ Avicennia marina (Forssk.) Vierh. Plants of the World Online, Kew Science. Accessed 19 March 2023.
  11. ^ "Avicennia marina subsp. australasica (Walp.) J.Everett — The Plant List". www.theplantlist.org.
  12. ^ "Avicennia marina subsp. eucalyptifolia (Valeton) J.Everett — The Plant List". www.theplantlist.org.
  13. ^ "Avicennia marina var. rumphiana (Hallier f.) Bakh. — The Plant List". www.theplantlist.org.
  14. ^ "Avicennia marina var. rumphiana (Hallier f.) Bakh". www.worldfloraonline.org. Retrieved 15 July 2023.
  15. ^ "Avicennia officinalis L. — The Plant List". www.theplantlist.org.
  16. ^ "Avicennia schaueriana Stapf & Leechm. ex Moldenke — The Plant List". www.theplantlist.org.

Further reading

External links

This page was last edited on 1 February 2024, at 10:07
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