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Kingdom: Plantae (Plant)
Subkingdom: Viridaeplantae (green plants)
Infrakingdom: Streptophyta
Phylum/Division: Tracheophyta (vascular plants)
Subphylum/Subdivision: Pteridophytina (club mosses, horsetails, ferns)
Class: Equisetopsida
Order: Equisetales
Family: Equisetaceae (horsetails)
Genus: Equisetum (horsetail, scouring rush)
Species: Equisetum arvense (western horsetail, giant horsetail)

 

Species: Equisetum variegatum (Northern scouring-rush)