Ferriss' horsetail
- kingdom: Plantae
- phylum: Tracheophyta
- class: Equisetopsida
- order: Equisetales
- family: Equisetaceae
- genus: Equisetum
- species: Equisetum ferrissii
Fort Smith
Northwest Territories
CanadaForrest City
ArkansasRoxborough Park
ColoradoBourbonnais
Bradley
Evanston
Kankakee
Thornton
IllinoisBenton Harbor
Haslett
MichiganEllensburg
Hazel Dell
Minnehaha
Port Townsend
Vancouver
White Salmon
Washington
United States