Phylum [Tracheophyta] Sinnott ex Caval.-Sm. (1998) - vascular plants Subphylum Lycopodiophytina Reveal (1996) [monotypic] Class Lycopodiopsida Bartl. (1830) Order Isoëtales Prantl (1874) [monotypic] 2 Family Isoëtaceae Rchb. (1828) [monotypic]