Sium suave is a species of flowering plant commonly known as hemlock-parsnip or water-parsnip. This plant is often associated with marshy or wet areas and is known for producing small, white or yellow flowers. While sium suave is the scientific name for this plant, there are several synonyms that can be used interchangeably. These synonyms include Apium suave, Cicuta bulbifera, and Sium piscatorium. Interestingly, while sium suave is a common plant, it can be confused with other species of hemlock or parsley, which can be toxic if ingested. Therefore, it is important to correctly identify the plant before use or consumption.