[Wildflowers West of the Cascades Mountains of Oregon and Washington]
Horsetails: The Genus Equisetum West of the Cascade Mountains of Oregon and Washington
Equisitaceae
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The photo at left shows the blunt-tipped cone
of smooth scouring-rush (Equisetum laevigatum) as seen in moist soils along an irrigation canal along
the Willard Springs Trail at Conboy Lake National Wildlife Refuge........July
28, 2006. The photo at right shows the black-tipped teeth
atop a sheath of smooth scouring-rush as seen in moist soils along an irrigation
canal along the Willard Springs Trail at Conboy Lake National Wildlife Refuge........July
28, 2006. The sheaths at each joint do not have a black band below the teeth
as in some other horsetails. Note also that the number of teeth is the same
as the number of ribs at the sheath.
Common Horsetail, Field Horsetail: Equisetum arvense (Synonym: Equisetum arvense var. boreale) -
Ferriss' Horsetail, Ferriss' Scouring Rush: Equisetum xferrissii (Synonym: Equisetum hyemale var. elatum) -
River Horsetail, Swamp Horsetail, Water Horsetail: Equisetum fluviatile (Synonym: Equisetum limosum) -
Common Scouring-rush, Common Scouring-rush, Dutch Rush, Prairie Scouring-rush, Scouring-rush Horsetail, Scouring Rush: Equisetum hyemale var. affine (Synonyms: Equisetum hyemale ssp. affine, Equisetum hyemale var. californicum, Equisetum praealtum) -
Smooth Horsetail, Smooth Scouring Rush: Equisetum laevigatum (Synonyms: Equisetum funstonii, Equisetum kansanum) -
Litorale Horsetail, Shore Horsetail: Equisetum xlitorale -
Marsh Horsetail: Equisetum palustre (Synonym: Equisetum paluste var. americanum) -
Giant Horsetail, Great Horsetail: Equisetum telmateia var. braunii (Synonym: Equisetum maximum, Equisetum telmateia ssp. braunii) -