tussock grass

from The Century Dictionary.

• noun A tall and elegant grass, Poa flabellata (Dactylis cæspitosa), a native of the Falkland Islands, Tierra del Fuego, and southern Patagonia, delighting in boggy and peaty ground.
• noun In Australia, a plant of the lily family, Lomandra (Xerotes) longifolia, considered the best native substitute for esparto.
• noun A tufted grass, Aira cæspitosa. Britten and Holland.