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Increased incidence of extensive hot fires may also be leading to the reduction of lancewood-bullwaddy environments.
Lancewood (Acacia shirleyi) and bullwaddy (Macropteranthes keckwickii) are found mostly in the east of the region, in scattered pockets of diminishing extent in the west, but do not extend to Western Australia.
Dominant vegetation is eucalypt woodland with a grassy understory, although lancewood (Acacia shirleyi) and bullwaddy (Macropteranthes keckwickii) vegetation harbors rainforest elements, and small pockets of mesic vegetation are found throughout the ecoregion, in riparian strips and in sheltered gorges of the Bungle Bungles.
The mammal fauna includes unusually abundant populations of the spectacled hare-wallaby (Lagorchestes conspicillatus), especially in the lancewood-bullwaddy thickets, and the northern nailtail wallaby (Onychogalea unguifera), especially in grasslands and open woodlands along the margins between black-soil plains and red loamy soils.
The ecoregion includes the most extensive stands of lancewood-bullwaddy found in Australia, but this is generally a fairly depauperate environment.
The relatively dense vegetation cover provided by the lancewood-bullwaddy canopy results in a sparse grass cover, while the extensive canopy cover and infrequency of fire provides an environment which supports forbs, small shrubs and vines with rainforest affinities.