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grass
Sign in to savethumb|Poa annua, an annual grass
Grass is a common type of plant with narrow leaves and flowering structures, with *Poa annua* being one example of an annual grass species. Grasses matter because they cover large areas of Earth's land surface and serve as a fundamental food source for many animals and humans.
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thumb|Poa annua, an annual grass
Grass refers to various families of plants. The three major families of grasslike plants are true grasses (Poaceae), sedges (Cyperaceae), and rushes (Juncaceae). Lawns and pasturelands are typically composed of true grasses, five of which cover 46% of the world's arable land: rice, wheat, maize, barley, and sugar cane.