Distribution: Occurring west of the Cascades crest in Washington, where known from Snohomish County; Washington and Quebec, Canada.
Habitat: Ponds and lakes at low elevations.
Flowers: June-August
Origin: Introduced from Eurasia
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Generalist
[none provided]
PNW Herbaria: Specimen records of Hydrocharis morsus-ranae in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Hydrocharis morsus-ranae checklist entry
OregonFlora: Hydrocharis morsus-ranae information
E-Flora BC: Hydrocharis morsus-ranae atlas page
CalPhotos: Hydrocharis morsus-ranae photos