Equisetum ×ferrissii
(= Equisetum hyemale × Equisetum laevigatum)
Ferriss's horsetail, Ferriss's scouring rush
Specimens
Photos

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

Description:
General:

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.

Leaves:

None

Spores:

Cone tip pointed; spores white and mishappen.

Accepted Name:
Equisetum ×ferrissii Clute
Publication: Fern Bull. 12: 22. 1904.

Synonyms & Misapplications:
Equisetum hyemale L. var. elatum (Engelm.) C.V. Morton [Peck]
Additional Resources:

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

26 photographs:
Group by