Xylopodium
A xylopodium is a underground storage growth which is multibranched and may cover a circle 9 metres (30 ft) diameter.[1] They differ from lignotubers which are more compact in form, like a tuber. They are most common in the cerrados of Brazil even including a monocot (Smilax goyazana),[1] but the mallee roots of Australia are more like xylopodia than lignotubers sensu stricto.