Etymology

button grass

Today it means: 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. Full definition →

First used 19th c.
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The story

From button + grass.

First known use, by meaning

  • from 19th c. 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.

Etymology from Wiktionary, CC BY-SA 4.0.