Domain Eucaryota Subdomain Chlorota Doweld (2001) Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981) Subkingdom Pteridobiotina Britton & A. Br. (1896) Superphylum Pteridophytanae Doweld (2001) Phylum Equisetophyta D.H.Scott (1900) see Division Monilophyta Cantino & Donoghue Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883) 1 Order †Gondwanostachyales Doweld (2001) see Order Equisetales DC. ex Bercht. & J.Presl (1829) 2 Order †Echinostachyales Doweld (2001) [monotypic] see Order Equisetales DC. ex Bercht. & J.Presl (1829) 3 Order Equisetales DC. ex Bercht. & J.Presl (1829) [monotypic]