A clump of pampas grass.
pampas grass definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a giant South American grass (Cortaderia selloana) cultivated for use as an ornamental and for its large, plumelike, silvery or pinkish panicles used in bouquets
pampas grass definition by American Heritage Dictionary
A grass (Cortaderia selloana) of southern South America, having silvery plumes and growing in large clumps more than three meters (ten feet) tall.
Origin: After the Pampas.