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 The Contiguous United States, Canada, and Alaska. They have simple, broad leaves. Flowers are visited by Ditemnus bidentatus, Lyroda, Leucopis minor, and Tharsalea mariposa. Individuals can grow to 12 dm.
EOL has data for 17 attributes, including: