Johnson grass

from WordNet (r) 3.0 (2006)

Johnson grass
    n 1: 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 [syn:
         {Johnson grass}, {Aleppo grass}, {means grass}, {evergreen
         millet}, {Sorghum halepense}]

from The Collaborative International Dictionary of English v.0.48

Johnson grass \John"son grass`\ [Named after W. Johnson of
   Alabama, who planted it about 1840-1845.] (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}.
   [1913 Webster]