scouring rush

English Thesaurus

1. evergreen erect horsetail with rough-edged stems; formerly used for scouring utensils (noun.plant)

hypernym	:	horsetail,
definition	:	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 (noun.plant)