Distribution: Known historically in Washington from west of the Cascades crest in Whatcom County; Alaska to British Columbia, east to Northwest Territories, Alberta, Montana, and Manitoba.
Habitat: Pond and lake margins, where emergent.
Flowers: June-August
Origin: Native
Growth Duration: Perennial
Conservation Status: Historical in Washington (WANHP)
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PNW Herbaria: Specimen records of Nymphaea tetragona in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Nymphaea tetragona checklist entry
OregonFlora: Nymphaea tetragona information
E-Flora BC: Nymphaea tetragona atlas page
CalPhotos: Nymphaea tetragona photos