Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, also eastward to the Great Lakes region and northeastern North America; circumboreal.
Habitat: In shallow water or along shorelines of ponds and lakes, from the lowlands to middle elevations in the mountains.
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
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PNW Herbaria: Specimen records of Isoetes tenella in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Isoetes tenella checklist entry
OregonFlora: Isoetes tenella information
E-Flora BC: Isoetes tenella atlas page
CalPhotos: Isoetes tenella photos