Pampas grass, pampas grass, or feathered reed (Cortaderia selloana) is a species of tall, herbaceous perennial plant in the family Poaceae, subfamily Danthonioideae. Native to South America, it is often grown as an ornamental plant. It is an invasive species.

The name Cortaderia comes from Spanish (Castilian) and means “cutter”, in reference to its long, thin and sharp leaves. The specific adjective selloana was given to it in 1818 by the naturalist Alexander von Humboldt (1769-1859), in homage to the German botanist and naturalist Friedrich Sellow who studied the flora of South America, in particular that of Brazil.

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