Equisetaceae
Horsetail Family
1 genera
14 species
4 subspecies and varieties
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Equisetum arvensecommon horsetail, field horsetail
Distribution: Cosmopolitan; throughout the Pacific Northwest
Habitat: Moist to moderately dry areas
Origin: Native
Equisetum ×ferrissiiFerriss' scouring rush
Origin: Native
Equisetum fluviatileor river horsetail, swamp, water
Distribution: Alaska to Oregon, east across southern Canada and the northern tier of states in the United States.
Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.
Origin: Native
Equisetum hyemalescouringrush horsetail , common scouring-rush
Distribution: Circumboreal; throughout the Pacific Northwest
Habitat: Moist to wet areas, lowlands to moderate elevations in the mountains
Origin: Native
ssp. affine – common scouring rush, Dutch rush, prairie scouring rush
Equisetum laevigatumsmooth scouring rush
Origin: Native
Equisetum ×litoraleshore horsetail
Origin: Native
Equisetum ×mackaiismall scouring rush
Origin: Native
Equisetum ×nelsoniiNelson's horsetail
Origin: Native
Equisetum palustremarsh horsetail
Distribution: Circumboreal, south south in North America to southern Washington, northern Idaho, Nebraska and Pennsylvania.
Habitat: Streambanks, wet meadows, and marshes, from the lowlands to moderate elevations in the mountains.
Origin: Native
Equisetum pratensemeadow horsetail
Origin: Native
Equisetum scirpoidessedgelike horsetail, dwarf scouring rush
Distribution: Circumboreal, south in North America to northeast Washington, east to northwest Montana, Minnisota, and New York.
Habitat: Moist, swampy places, especially in coniferous forests.
Origin: Native
Equisetum sylvaticumwood horsetail, woodland horsetail
Distribution: Alaska to Washington, east across southern Canada and northern United States to the Atlantic Coast
Habitat: Shady coniferous forests, bog edges and swamps
Origin: Native
Equisetum telmateiagiant horsetail
Distribution: British Columbia to California, east to Idaho
Habitat: Moist areas in the lowlands
Origin: Native
ssp. braunii – giant horsetail, great horsetail
Equisetum variegatumvariegated horsetail, northern scouring-rush
Distribution: Alaska to Oregon, east across southern Canada and the northern third of the United States
Habitat: Wet places, sea level to alpine
Origin: Native
ssp. alaskanum – Alaskan scouring rush
ssp. variegatum – variegated horsetail, northern scouring rush