Distribution: Occurring chiefly west of the Cascades crest; Alaska to California, east to the Rocky Mountains.
Habitat: Submerged in ponds and lakes, often in deep water, from the lowland to middle elevations in the mountains.
Origin: Native
Conservation Status: Not of concern
[none provided]
PNW Herbaria: Specimen records of Isoetes occidentalis in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Isoetes occidentalis checklist entry.
E-Flora BC: Isoetes occidentalis atlas page.
CalPhotos: Isoetes occidentalis photos.
USDA Plants: Isoetes occidentalis information.