Alice Springs ancient Australia brown bush central Australia desert-country desert-region dry height high hill hills historic hot inland mountainous mountains outback ridge rocks rocky rough rugged scrub shrubbery sunlight sunshine terrain textures trees foliage gully native native-palm palm palm-tree shrubs vegetation central-Australia light rustic sky stepping-stones steps blue clear-sky allocasuarina allocasuarina-decaisneana angiosperm arid Australian-pine branchlets Casuarina conifer-like desert-oak distinctive evergreen feathery-foliage green hardy leaf leaves medium-sized tree she-oak sheoak tiny-scales tree whorls