(= Equisetum hyemale × Equisetum laevigatum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Dry to wet, often disturbed areas, including gravelly roadsides.
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Annual to perennial herb, 20-180 cm; sheath 7-17 mm, 3-12 mm broad, commonly with dark bands; teeth 14-32, deciduous or persistent.
None
Cone tip pointed; spores white and mishappen.
Publication: Fern Bull. 12: 22. 1904.
PNW Herbaria: Specimen records of Equisetum ×ferrissii in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Equisetum ×ferrissii checklist entry
OregonFlora: Equisetum ×ferrissii information
E-Flora BC: Equisetum ×ferrissii atlas page
CalPhotos: Equisetum ×ferrissii photos
