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Sorghum-almum or Columbus grass, Sorghum almum

Perennial from relatively short, thick, scaly underground runners.  This species often looks like somewhat like corn seedlings when small.  Stems are stout and up to 14 feet tall.  Leaf blades are flat, sandpapery; lack longer hairs except occasionally at the base on the upper leaf surface and are ½ to 1 ½ inches wide and 18 to 32 inches long.  Leaf sheaths are smooth.  Seedheads are 6 to 24 inches long with wide spreading branches.  Flowers are towards the tip of the branches.  Flowers are born in pairs, one with a stalk and one without.  Flowers and seeds are 3/8 to ¼ inch long, and seeds are smooth.  Propagation can be by seed or underground runners.  It can be found in cultivated fields, roadsides, and ditches.  This species is an introgressive hybrid between johnsongrass, Sorghum halepense, and grain sorghum, Sorghum bicolor subspecies bicolor.  The thick underground runner makes this weed difficult to control.