Heteranthera reniformis - Ruiz & Pavon
Pontederiaceae (Pickerelweed) Family
The leaves are alternate on the stem, smooth; the blade being less than 2 inches in length or width; cordate or reniform in shape. The tip is obtuse or rounded at the apex and bilobate at the base. The leaf stalk is usually 4 to 7 inches long.
Identification can be misleading as the plant is often confused with Heteranthera limosa.