Historically, Seabeach Amaranth was found in nine states ranging from Massachusetts to South Carolina. However it is currently only found in seven: New York, New Jersey, Delaware, Maryland, Virginia, North Carolina, and South Carolina. The plant was listed as threatened in April 1993. At that time, only 55 populations were known. The most serious threats to its survival include: construction of beach stabilization structures, beach erosion, tidal flooding, being eaten by (predation) feral animals and insects - particularly the webworm, and in some places, by damage from off-road vehicles.

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