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Sium suave (Hemlock Waterparsnip) is a species of perennial herb in the family Apiaceae. They have a self-supporting growth form. They are native to The Contiguous United States, Canada, and Alaska. They have simple, simple leaves. Flowers are visited by Eupsyche, Eurytoma, Myrmosa, and Ageniella.

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EOL has data for 14 attributes, including:

Known occurrences, collected specimens and observations of hemlock waterparsnip. View this species on GBIF