[Horsetails: The Genus Equisetum in the Cascade Mountains of Oregon and Washington]

Ferriss' Horsetail, Ferriss' Scouring Rush

Equisetum xferrissii

Synonym: Equisetum hyemale var. elatum

Ferriss' Horsetail, Ferriss' Scouring Rush: Equisetum xferrissii (Synonyms: Equisetum hyemale var. elatum, Equisetum hyemale var. intermedium, Equisetum hyemale x laevigatum, Equisetum intermedium) - Ferriss' Horsetail, Ferriss' Scouring Rush: Equisetum xferrissii (Synonyms: Equisetum hyemale var. elatum, Equisetum hyemale var. intermedium, Equisetum hyemale x laevigatum, Equisetum intermedium)

Ferriss' scouring rush as seen in a road side ditch along the north side of old Highway 8 at Rowland Lake, western Klickitat County, WA.........May 20, 2011.
Paul Slichter