Scientific name: Nassella tenuissima (Trin.) Barkworth
Common name: Mexican feather grass, Tussock grass
Additional information about Mexican feather grass is located on the Agriculture Victoria website - including plant status (e.g. state prohibited), why the danger, identification, what to do if located.
Information on Mexican feather grass on the Tasmanian Department of Primary Industries, Parks, Water and Environment's website (external link).