Johnson grass

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

• noun A tall rhizomatous perennial grass (Sorghum halepense) native to the Mediterranean region, sometimes cultivated for forage but widespread as a weed.

from The Century Dictionary.

• noun See grass.

from the GNU version of the Collaborative International Dictionary of English.

• (Bot.) A tall perennial grass (Sorghum Halepense), valuable in the Southern and Western States for pasture and hay. The rootstocks are large and juicy and are eagerly sought by swine. Called also Cuba grass, Means grass, Evergreen millet, and Arabian millet.

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

• noun A perennial Mediterranean grass (Sorghum halepense) cultivated for forage

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

• noun tall perennial grass that spreads by creeping rhizomes and is grown for fodder; naturalized in southern United States where it is a serious pest on cultivated land