carpet grass

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several sod-forming grasses of the genus Axonopus, especially A. fissifolius (syn. A. affinis), cultivated for turf and pasture in warm humid regions.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of the genus Axonopus of American tropical and subtropical grasses, some of which are rhizomatous.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus