Ptilotus nobilis

About

Ptilotus nobilis, commonly known as yellowtails, regal foxtail or tall mulla mulla, is an annual or short-lived perennial herb of the family Amaranthaceae and is found in arid areas of all mainland states and the Northern Territory of Australia. It is deeply taprooted, with egg-shaped to lance-shaped leaves with the narrower end towards the base, and cylindrical spikes of yellowish green or creamy-green flowers.

Summary from Wikipedia