arching Australian black boy bush bushland dumbbell flowers evergreen flowering fragrant grass tree Kingia australis layers mantle multiple flower stalks outback plant resin slow-growing spike spiny leaves stout trunk tall unusual abstract background brown descending dried dry fronds hanging layered leaf leaves lines remainder spiky strands texture vegetation Xanthorrhoea alpine armour armoured Asteraceae Carlina acaulis carline dicotyledon Eberwurz edible europe fortune Good humidity hunter's bread hurt indicator medicine needles perennial rosette silver thistle spine spiny star stemless sun thistle thorn thorny traditional angled angles appearance green light rigid standing straight sunlight thorns upright wallpaper wild black-boy bush-plants corner garden grass-tree ground-cover multiple-flower-stalks native-plants plants raised-garden spikes spiny-leaves stout-trunk trimmed Xanthorrhoea-preissii appearances arid Cacti cactus clumps clusters coloring colors colouring colours display edge edges flora garden-display garden-plants irregular ornamental perennials pointed protection shape shapes sharp short-spikes small-spines spines succulents surface surfaces textures