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grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus

: a grass (Sporobolus poiretii) native to the West Indies but common in the southern United States that often has its tufted wiry stems and narrow panicles infested with a fungus (Helminthosporium ravenelii) — called also blackseed, carpet grass

smut grass,

a rushy grass growing in warm regions, with spikes usually blackened by a smut.