约翰逊草

[ 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
<noun.plant>

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}.