alligator weed

noun
variants: or alligator grass

Definition of alligator weed 

: a prolific herbaceous weed (Alternanthera phylloxeroides) having opposite entire linear-lanceolate leaves and flowers in short headlike spikes and being especially troublesome in irrigation canals and waterways which it clogs with a dense floating mass

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First Known Use of alligator weed

1887, in the meaning defined above

History and Etymology for alligator weed

so called from its long narrow leaves

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The first known use of alligator weed was in 1887

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