Hydrocotyle verticillata is a small, creeping, perennial herb that is native to the Americas. It is a popular aquatic plant that is often used in aquariums and water gardens. The plant has small, round leaves that grow in whorls around the stem. The stems are thin and delicate, and can grow up to 18 inches (45 cm) in length. The plant produces small, white flowers that bloom in the summer.