Alligator weed
Alternanthera philoxeroides Alligator
weed is an emersed plant. It can grow in a variety of habitats,
including dry land, but is usually found in water. It may form sprawling
mats over the water or along shorelines.
Alligator weed stems are long, branched, and hollow. Leaves are simple,
elliptic, and have smooth margins. Leaves are opposite. The whitish
papery flowers grow on stalks. Alligator weed flowers during the warm
months.
http://aquat1.ifas.ufl.edu/alphpic.html
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