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Alternanthera philoxeroides

Alligatorweed 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. Alligatorweed stems are long branched, and hollow. Leaves are simple, elliptic, and have smooth margins. The leaves are the opposite. The whitish papery flowers grow on stalks. Alligatorweed flowers during the warm summer months.

Also known as: Green lead plan; pigweed