Avicennia marina
Avicennia marina var resinifera next to Barker Inlet, South Australia
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Lamiales
Family:	Acanthaceae
Genus:	Avicennia
Species:	A. marina
Binomial name
Avicennia marina (Forssk.) Vierh.

Avicennia marina, commonly known as grey mangrove or white mangrove, is a species of mangrove tree classified in the plant family Acanthaceae (formerly in the Verbenaceae or Avicenniaceae). As with other mangroves, it occurs in the intertidal zones of estuarine areas. It is distributed along the east coast of Africa, Southwest Asia, throughout south and south-east Asia, and into Australia. In Australia, it extends much farther south than any other mangrove, occurring in every mainland State. It also occurs in New Zealand between 34 and 38 degrees south; its Māori name is 'manawa'. It one of the few mangroves found in the arid regions of the coastal Arabian Peninsula, mainly in sabkah environments in the United Arab Emirates^[1], Qatar ^[2], Oman^[3], as well as in similar environments on both side of the Red Sea in Yemen^[4], Saudi Arabia^[5], Egypt and eastern Sudan^[6], and southern Iran^[7] along the Persian Gulf coast.

Avicennia marina var. resinifera fruit.

Grey mangroves grow as a shrub or tree to a height of three to ten metres, or up to 14 metres in tropical regions. The habit is a gnarled arrangement of multiple branches. It has smooth light-grey bark made up of thin, stiff, brittle flakes. This may be whitish, a characteristic described in the common name. The leaves are thick, five to eight centimetres long, a bright, glossy green on the upper surface, and silvery-white, or grey, with very small matted hairs on the surface below. As with other Avicennia species, it has aerial roots (pneumatophores); these grow to a height of about 20 centimetres, and a diameter of one centimetre. These allow the plant to absorb oxygen, which is deficient in its habitat. These roots also anchor the plant during the frequent inundation of seawater in the soft substrate of tidal systems. The flowers range from white to a golden yellow colour, are less than a centimetre across, and occur in clusters of three to five. The fruit contains large cotyledons that surround the new stem of a seedling. This produces a large fleshy seed, often germinating on the tree and falling as a seedling.^[8] The grey mangrove can experience stunted growth in water conditions that are too saline, but thrive to their full height in waters where both salt and fresh water are present. The species can tolerate high salinity by excreting salts through its leaves.^[9]

The distribution of the species is disjunct in Western Australia; the population of the Abrolhos Islands is 300 kilometres further south than nearest population of Shark Bay, another mangrove system is found even further south than this (500 km) at Bunbury. This colonisation of southerly climes may have occurred relatively recently, perhaps only several thousand years ago, when they were transferred by the Leeuwin Current.^[9] In South Australia along the Barker Inlet and Port River, A. marina forests form a hatchery for much of the states fish and shellfish.^[8]

Grey mangrove is a highly variable tree, with a number of ecotypes, and forms closely resembling other species. It has been reported to tolerate extreme weather conditions, high winds, and various pests and diseases. It is a pioneer in muddy soil conditions with a PH value of 6.5 to 8, but is intolerant of shade. A number of botanists have proposed division of the species, but currently three subspecies are recognised:

• Avicennia marina subsp. australasica
• Avicennia marina subsp. eucalyptifolia
• Avicennia marina subsp. marina

[edit] Notes

[edit] References

• "Avicennia marina". FloraBase. Department of Environment and Conservation, Government of Western Australia. http://florabase.dec.wa.gov.au/browse/profile/6828. 
• Boland, D. J. et al. (1984). Forest Trees of Australia (Fourth edition revised and enlarged). CSIRO Publishing, Collingwood, Victoria, Australia. ISBN 0-643-05423-5. .
• Duke, N.C. (1991). "A Systematic Revision of the Mangrove Genus Avicennia (Avicenniaceae) in Australasia". Australian Systematic Botany 4 (2): 299–324. doi:10.1071/SB9910299. 

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