Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Moist to wet areas, lowlands to moderate elevations in the mountains
Origin: Native
Conservation Status: Not of concern
[none provided]
PNW Herbaria: Specimen records of Equisetum hyemale ssp. affine in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Equisetum hyemale ssp. affine checklist entry
OregonFlora: Equisetum hyemale ssp. affine information
E-Flora BC: Equisetum hyemale ssp. affine atlas page
CalPhotos: Equisetum hyemale ssp. affine photos