Grass

Grass any plant of the family Gramineae, an important and widely distributed group of vascular plants, having an extraordinary range of adaptation. Numbering approximately 600 genera and 9,000 species, the grasses form the climax vegetation (see ecology ) in great areas of low rainfall throughout the world: the prairies and plains of North America, the savannas and pampas of South America, the steppes and plains of Eurasia, and the veldt of Africa.

Most grasses are annual or perennial herbs with fibrous roots and, often, rhizomes. The stems are always noded and are typically hollow and swollen at the nodes, although many genera have solid stems. The leaves have two parts: a sheath surrounding the stem (called the culm in grasses); and a blade, usually flat and linear. The flowers are of a unique form, the inflorescence being subdivided into spikelets each containing one or more tiny florets. (In other flowering plants the inflorescences are clusters of separate flowers, never spikelets.) The dry seedlike fruit is called a caryopsis, or grain.

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