Distribution: Occurring chiefly east of the Cascades crest in south-central Washington; south-central Washington to California, east to the Rocky Mountains, native to central and eastern North America.
Habitat: Mudfalts, mud-bottomed pools, backchannels, and other slow-moving water of streams and rivers.
Flowers: July-September
Origin: Introduced from central and eastern North America
Growth Duration: Perennial
Conservation Status: Not of concern
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PNW Herbaria: Specimen records of Bacopa rotundifolia in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Bacopa rotundifolia checklist entry
OregonFlora: Bacopa rotundifolia information
E-Flora BC: Bacopa rotundifolia atlas page
CalPhotos: Bacopa rotundifolia photos