Examines characteristics, classes, adaptations, and definitions of this plant division.

Offers introductory information on this species.

Offers general information on this plant group. From the Columbia Encyclopedia, Sixth Edition. 2001-05.

Provides general information on these plant species. With links to related articles.

Provides information and links to taxonomic groups belonging to this phylum.

Presents a catalogue of flowers from this phylum. With ordering information.

Provides listing of the members of these plant species.

Presents an overview of club mosses and scale trees.

Information includes taxonomy and nomenclature, taxonomic hierarchy, references, and additional resources.

Presents a list of representative species under natural and cultivated categories. With information on family, genus, species and intraspecific taxa.