Sium suave (Hemlock Waterparsnip) is a species of perennial herb in the family Apiaceae. They are native to Alaska, Canada, and The Contiguous United States. Flowers are visited by Tharsalea dorcas, Conura debilis, Anoplius atrox, and Trypoxylon clavatum. Individuals can grow to 12 dm.
EOL has data for 14 attributes, including: