Origin: Native
Conservation Status: Not of concern
[none provided]
Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, and Utah, also from the central U.S. east to the Atlantic Coast.
Occurring chiefly west of the Cascades crest in Washington; southwestern British Columbia to California, also from the southern Great Plains east to the Atlantic Coast in the U.S.
Occurring chiefly west of the Cascades crest in Washington; Washington to California, east to Alberta, Idaho, Montana, and Colorado, and east from the Great Plains to the Atlantic Coast.PNW Herbaria: Specimen records of Wolffia in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Wolffia checklist entry
OregonFlora: Wolffia information
E-Flora BC: Wolffia atlas page
CalPhotos: Wolffia photos