Kingdom: Plantae (plants)
Division: Anthocerotophyta (hornworts)
Division: Bryophyta (mosses)
Division: Hepatophyta (liverworts)
Subkingdom: Tracheobionta (vascular plants)
Division: Equisetophyta (horsetails)
Class: Equisetopsida
Order: Equisetales
Family: Equisetaceae (Horsetail family)
Species: Equisetum arvense (Field Horsetail) (~ photos ~)
Species: Equisetum hyemale (Horsetail, Scouring Rush) (~ photos ~)
Division: Lycopodiophyta (ferns)
Division: Psilophyta (whisk-ferns)
Division: Pteridophyta (ferns)
Superdivision: Spermatophyta (seed plants)