Sorghum halepense - johnsongrass
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Johnson-grass is a
tall (to 6 feet), rhizomatous perennial grass that invades open areas
throughout the United States. The long (2 feet), lanceolate leaves are
arranged alternately along a stout, hairless, somewhat upward branching
stem. Flowers occur in a loose, spreading, purplish panicle.
Johnson-grass is adapted to a wide variety of habitats including open
forests, old fields, ditches, and wetlands. It spreads aggressively and
can form dense colonies, displacing native vegetation and restricting
tree seedling establishment. Johnson-grass has naturalized throughout
the world but is thought to be native to the Mediterranean region. It
was first introduced into the United States in the early 1800s as a
forage crop.
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