An elegant aquatic plant, found in many parts of Britain and Ireland, but supposed to have been introduced, and not native. It forms widely extending immersed stems, rooting freely below and branching at the extremities, the branches ascending to the surface of the water, and terminating in a tuft of leaves deeply heart-shaped, on long stalks, and floating on the surface. The flowers are large, bright yellow, on long stalks, appearing above water in June, July, and August. It may easily be introduced into pieces of water, natural or artificial, by procuring divisions and immersing them, and otherwise treating them as described already for Water-Lilies; and seed, if more handy, may be treated in precisely the same way, taking care to sow them as soon as ripe.