Mulga Woodlands of Outback Areas of Australia


The Western Australian Mulga shrublands is a large

dry World Wildlife Fund ecoregion of inland Western


The region consists of the Gascoyne

and Murchison bioregions of the Interim Biogeographic

Regionalisation for Australia (IBRA)









      Gascoyne IBRA                            Murchison IBRA


The dominant vegetation is mulga trees, a type of acacia adapted to the hot, dry climate by means of long tap roots.

Mulga is hightly variable in:

  • form
  • height
  • shape of leaf parts

Mulga can form:

  • dense forests 15 meters high
  • small, low shrubs spread well apart

Dry climate adaptations include:

  • thick-skinned leaves
  • sunken stomata
  • tiny hairs to reduce transpiration
  • drought deciduous. Leaves provide mulch and decompose and recycle nutrients to tree


File:Mulga heath.jpg



In some areas the mulga trees are surrounded by Eriachne grassland.

File:Eriachne aristidea habit.jpg




Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Poales
Family: Poaceae
Genus: Eriachne












File:Acacia aneura pods.jpg

Acacia aneura branch with seed pods