The Class of
C. Agardh, Classes Pl. (1): 7. 20 Mai 1825

Kingdom  Plantae - Plants
 Subkingdom  Tracheobionta - Vascular plants
   Division   Equisetophyta - Horsetails
    Class   Equisetopsida
      Order   Equisetales
        Family   Equisetaceae - Horsetail Family
            Genus  Equisetum
             Species  arvense Part of Taxonomy Collection
      Order   †Calamitales
        Family   Calamitaceae
      Order   †Sphenophyllales
        Family   Sphenophyllaceae         

This Class contains of 15 or 16 species, belonging to two genera:

EQUISETOPSIDA EQUISETACEAE Equisetum - horsetails 8 sp.
    Hippochaete - scouring rushes 7 sp.