Equisetum hyemale robustum


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Noun1.Equisetum hyemale robustum - evergreen erect horsetail with rough-edged stems; formerly used for scouring utensils
horsetail - perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in northern hemisphere; some in Africa and South America