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Noun: Equisetum hyemale robustum
  1. Evergreen erect horsetail with rough-edged stems; formerly used for scouring utensils
    "Pioneers used Equisetum hyemale robustum to clean their pots";
    - scouring rush, rough horsetail, Equisetum hyemale, Equisetum robustum

Type of: horsetail