[[Image:Atriplex cinerea (Grey Saltbush).jpg|thumb|Atriplex cinerea in flower and fruit.]]
Atriplex cinerea, commonly known as Grey Saltbush, Coast Saltbush, or Dune Saltbush, is a species of [[flowering plant]] in the family [[Amaranthaceae]] (formerly Chenopodiaceae). It is a [[halophyte]] [[shrub]] native to the coastal regions of southern Australia.
Description
Atriplex cinerea is a woody [[shrub]] typically growing to 0.5–2 metres (1.6–6.6 ft) high and up to 3 metres (9.8 ft) wide, though it can sometimes be prostrate or low-spreading. Its distinctive feature is the silvery-grey appearance of its foliage, which is covered in minute, glistening scales.- Leaves: The leaves are [[alternate (botany)|alternate]], [[obovate]], [[elliptic]], or [[oblanceolate]] in shape, measuring 1–4 cm (0.39–1.57 in) long and 0.5–1.5 cm (0.20–0.59 in) wide. They have entire margins and a short [[petiole]].
- Flowers: Atriplex cinerea is a [[dioecious]] species, meaning male and female flowers are borne on separate plants. The flowers are small, inconspicuous, and lack petals.
- Male flowers: Arranged in dense, leafy [[panicle (botany)|panicles]] at the ends of branches, with 5 [[tepal]]s and 5 [[stamen]]s.
- Female flowers: Clustered in the [[axil (botany)|axils]] of the upper leaves or in leafy [[spike (botany)|spikes]], usually consisting of two [[bracteole]]s that enclose the [[ovary]].
- Fruit: The fruit is a small, dry, one-seeded structure (an [[achene]]) enclosed within two enlarged, spongy, triangular, or heart-shaped bracteoles that are fused at the base. These bracteoles can be 3–6 mm long and become somewhat woody when mature. The seeds are dark brown and somewhat flattened.
Taxonomy
Atriplex cinerea was first formally described by [[Louis Née]] in 1801, with the description published in Anales de Historia Natural. The specific [[epithet]] cinerea is [[Latin]] for "ash-grey," referring to the color of its foliage.It belongs to the genus Atriplex, which comprises a large group of plants commonly known as saltbushes, many of which are adapted to saline environments. The family Amaranthaceae also includes other well-known genera such as Chenopodium (goosefoot) and Spinacia (spinach).
Distribution and habitat
Atriplex cinerea is native to the coastal regions of all states of southern Australia, including [[Western Australia]], [[South Australia]], [[Victoria (Australia)|Victoria]], [[Tasmania]], and [[New South Wales]]. It typically grows in:- Coastal dunes: Often found on foredunes and hinddunes, where it plays a crucial role in sand stabilization.
- Saltmarshes: Tolerant of waterlogged and highly saline soils.
- Estuarine mudflats: Thrives in areas influenced by tidal action.
- Coastal cliffs and rocky shores: Adapted to harsh, exposed conditions.
It is a resilient species, highly adapted to saline environments, wind exposure, and sandy soils, making it an important component of coastal ecosystems.
Ecology
As a halophyte, Atriplex cinerea has specific adaptations to survive in high-salt environments. These include specialized salt glands on its leaves that excrete excess salt, and a thick cuticle that reduces water loss.It is a pioneer species on coastal dunes, helping to stabilize sand and create conditions for other plants to establish. Its dense, sprawling habit provides shelter for small native animals and birds. The foliage can also be a food source for some native herbivores, and its seeds are consumed by birds.
Uses
- Dune stabilization: Its extensive root system and ability to trap sand make it invaluable for coastal erosion control and dune rehabilitation projects.
- Landscaping: Due to its attractive silvery foliage, drought tolerance, and salt tolerance, Atriplex cinerea is increasingly used in coastal gardens, xeriscaping, and revegetation of challenging sites.
- Fodder: Like many other saltbush species, Atriplex cinerea can be browsed by livestock, particularly in arid and semi-arid regions or during droughts, providing a source of feed when other vegetation is scarce. However, its high salt content requires careful management for livestock.
- Traditional uses: Indigenous Australians traditionally used various parts of saltbush species for food and medicinal purposes, though specific uses for A. cinerea vary by region.
Conservation status
Atriplex cinerea is generally considered common and widespread within its natural range and is not listed as a threatened species. Its resilience to harsh coastal conditions contributes to its stable population status. However, like many coastal plants, its habitats can be vulnerable to human development, invasive species, and climate change impacts such as sea-level rise and increased storm intensity.Gallery
[[Category:Atriplex]] [[Category:Flora of Western Australia]] [[Category:Flora of South Australia]] [[Category:Flora of Victoria (Australia)]] [[Category:Flora of Tasmania]] [[Category:Flora of New South Wales]] [[Category:Halophytes]] [[Category:Coastal plants]] [[Category:Shrubs of Australia]]