Sium suave (Hemlock Waterparsnip) is a species of perennial herb in the family umbellifers. They have a self-supporting growth form. They are native to Alaska, Canada, and The Contiguous United States. They have simple, broad leaves. Flowers are visited by Mesopolobus fasciiventris, Corimelaena pulicaria, Hypostena, and Euxesta notata. Individuals can grow to 12 dm.
EOL has data for 18 attributes, including: