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Giant salvinia, Salvinia molesta D. S. Mitchell (Salviniaceae), is an invasive free-floating fern native to southeastern Brazil that has plagued waterways of tropical and subtropical regions of the world. In 1998, giant salvinia was reported along the border of Texas and Louisiana in the Toledo Bend Reservoir, subsequently spreading uncontrollably creating dense mats of weed on lakes, ponds and reservoirs throughout the southeastern United States.


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