Equisetaceae
Horsetail Family
1 genera
13 species
4 subspecies and varieties
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Equisetum arvensecommon horsetail, field horsetail
Distribution: Occurring on both sides of the Cascades crest; widespread throughout North America.
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
Distribution: Widely distributed throughout Washington; circumboreal; widespread throughout most of North America.
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: Widespread throughout most of Washington; circumboreal;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 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: Scattered on both sides of the Cascades crest in Washington; 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 telmateia
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Idaho.
Habitat: Moist areas in the lowlands.
Origin: Native
ssp. braunii – giant horsetail, great horsetail
Equisetum variegatum
Distribution: Occurring chiefly east of the Cascades crest in Washington; 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