Turtlehead is a colloquial term for the flowers of the chelone, a perennial plant native to North America. Some synonyms for turtlehead include balmony, bitter herb, cod head, fish mouth, and snakehead. These names often refer to the plant's snake-like appearance, with elongated petals and a curved shape resembling a fish or snake's mouth. Turtlehead is a popular garden plant due to its showy flowers, which range in color from pink to white. It is also used in traditional medicine, where it is believed to have purifying and cleansing properties. However, it should be used with caution as it can be toxic in large quantities.