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any of several aromatic herbs of the genus Sium, especially S. latifolium, belonging to the parsley family (Apiaceae), distributed throughout the Northern Hemisphere and Africa. They grow in moist areas, and some species are even partially submerged. All are perennial herbs with divided leaves and clusters of white flowers. S. sisarum, known as skirret, is cultivated for its edible tuberous roots. The more common S. latifolium, however, is known to be poisonous to livestock.