Sorghum Grasses.
Johnson grass (Sorghum halepense) is a coarse, drought-resistant perennial in the southern states and an annual in the northern states. It has scaly root stalks and relatively broad leaves, and grows 6 to 8 ft (1 to 2 m) tall as described previously in the section on ''Neurologic Disease-Inducing Plants.'' Sudan grass (S. sudanense) and its hybrids are corn-like in appearance and are often grown as a forage crop. Cyanide-free varieties are available and are useful as a forage crop.
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