Article

Christenhusz, M.J.M., Reveal, J.L., Farjon, A., Gardner, M.F., Mill, R.R. & Chase, M.W. 2011. A new classification and linear sequence of extant gymnosperms. Phytotaxa 19: 55-70. ≡

Original Classification (root)

(Class) Equisetopsida C.Agardh (1825)