Hydrocotyle verticillata, also known as whorled pennywort, whorled marshpennywort or shield pennywort, is a flowering plant found in South and North America and the West Indies. The creeping plants with unusual leaves give it its common names. It grows in places that are marshy, boggy, and wet. Hydrocotyle verticillata is used in aquaria, where it is undemanding but prefers a good substrate, and at least moderate light. It benefits from additional carbon (Wikipedia)