Genus Sium refers to a group of aquatic plants that belong to the family Apiaceae. These plants are mainly found in marshes, streams, and wetlands, and are known for their medicinal qualities. There are several synonyms for the name Genus Sium, including Helosciadium, Hafnium, and Spergulastrum. The plants under this genus are characterized by their lobed, dissected, or pinnatifid leaves and their small white flowers that grow in clusters. Some of the species of Genus Sium are known for their ability to treat digestive issues, respiratory ailments, and fever. Overall, Genus Sium is a valuable group of plants that serve medicinal and ecological purposes.