Alligatorweed is an invasive aquatic weed that can be found in the coastal plain from Virginia to Florida and westward to Texas. This weed is now also found in coastal California. Opposite, elliptic in outline, from 2 to 4 inches in length. Fleshy and succulent, light to dark green or pink to purplish in color, and reach 3 feet in length. Fibrous roots occur at the stem nodes.
Roots can be free-floating in water or occur in the soil.
Flowering usually occurs from April through October. Aquatic mat forming perennial with hollow stems, opposite leaves, and solitary white flowers.