Fimbristylis spadicea, commonly known as marsh fimbry or saltmarsh fimbristylis, is a perennial sedge of the family Cyperaceae. It is native to the coastal Americas from New York and northwestern Mexico to northeastern Argentina and Peru.

The species was first described as Scirpus spadiceus by Carl Linnaeus in 1753. In 1805 Martin Vahl placed it in the newly-described genus Fimbristylis as Fimbristylis spadicea. The species has over two dozen synonyms.

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