allocasuarina allocasuarina-decaisneana angiosperm arid Australian-pine branchlets Casuarina conifer-like desert-country desert-oak desert-region distinctive dry evergreen feathery-foliage foliage green hardy hot inland leaf leaves medium-sized tree native she-oak sheoak textures tiny-scales tree trees vegetation whorls abstract Australian backdrop background beefwood bull-oak buloke cassowary-tree coastal common drooping endemic equisetoid ironwood needles salt-tolerant segmented-branchlets small-scale-leaves soft-needles species twigs variety various wallpaper weeping wind-tolerant