
Origin: Native
Conservation Status: Not of concern
[none provided]
Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.PNW Herbaria: Specimen records of Sium in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Sium checklist entry
OregonFlora: Sium information
E-Flora BC: Sium atlas page
CalPhotos: Sium photos