Member of the Polygonaceae family. Swamp smartweed reaches a height of up to 3 feet, and it grows in marshes or ditches over much of the United States. Its leaves are alternately arranged along its stem, and are linear-lanceolate in shape. Leaf petioles are wrapped in an ocrea where they meet the stem. Small, greenish/white flowers grow on erect racemes atop the plant. Swamp smartweed can sometime bear pinkish flowers, and it is considered a semiaquatic plant. Blooms July-October.