Johnson grass : 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.

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Taxonomy
Johnson grass, plants, rhizomes, University of Illinois, herbicide, species, Roundup, grass, ground, infestation, leaves, Illinois Agriculture, seed, livestock, Illinois plants, Agriculture Experiment Station, Stems, panicles.

Defination from the web:
Johnson grass should be accurately identified before attempting any control measures. ... Johnson grass does not infest areas of high natural quality heavily except for the naturally disturbed environment along river banks in southern ...