button grass

== English == === Alternative forms === buttongrass, button-grass === Etymology === From button +‎ grass. === Noun === button grass (uncountable) (chiefly Australia) Any of several grasses with round or globular flower heads; especially Gymnoschoenus sphaerocephalus, a tussock-forming sedge especially of western Tasmania, forming distinct plains; and Dactyloctenium radulans, an annual grass of mainland Australia. [from 19th c.] 2004, Nicholas Shakespeare, In Tasmania, Harvill Press, p. 73: Button-grass plains grew in peaty soil to the water's edge.