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scouring rush, rough horsetail, Equisetum hyemale, Equisetum hyemale robustum, Equisetum robustum | evergreen erect horsetail with rough-edged stems; evergreen erect horsetail with rough-edged stems; formerly used for scouring utensils ❲Equisetum robustum, Equisetum hyemale, Equisetum hyemale robustum❳ |