Stonewort is a type of freshwater algae that grows in ponds, rivers, and lakes. It is also known by several other names such as charophyte, nitella, and starry stonewort. Charophyte is used to refer to stonewort because it belongs to the Characeae family. Nitella is another common name used for stonewort due to the primordial days when it was believed to source nitrogen from the atmosphere. Starry stonewort is a name that originates from its star-like pattern of growth. Other synonyms for stonewort include bryophytes and aquatic plants. Stonewort is known for its medicinal properties and is used in the treatment of various ailments.