Ferriss' Horsetail, Ferriss' Scouring Rush
Equisetum xferrissii
Synonym: Equisetum hyemale var. elatum
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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