Pearlwort, a small herbaceous plant known for its tiny white or yellow flowers, has several synonyms. One of its most common synonyms is "cotula" or "cotula coronopifolia," which is a plant species within the Asteraceae family. Another synonym for pearlwort is "sagina," which comes from the Latin word "sagum" meaning cloak or mantle. Sagina is a genus of small herbaceous plants that belong to the family Caryophyllaceae. Pearlwort is also commonly referred to as "Irish moss" or "Scotch moss" due to its moss-like appearance, but it is not actually a species of moss.