- Absolute Astronomy: Horsetail
- Discusses molecular data, species, hybrids, geographic links, and definitions.
- BioLib: Gallery Equisetophyta
- Shows images of members of this plant group.
- Biology of Vascular Plants Lab Manual: Divisions Equisetophyta and Pteridophyta
- Contains links to information on the two divisions.
- Comparison of Living Pteridophyte groups
- Compares the characteristics of the psilotophyta, equisetophyta, lycopodiophyta and polypodiophyta.
- Equisetaceae
- Describes this group of homosporous vascular plants comprising a single genus with about 15 species. With images and links.
- Equisetophyta
- Contains images of this plant species. With Polish description.
- Equisetophyta Life Cycle Stages
- Shows the growth cycle of this plant group. Includes text and diagram.
- Equisetophyta Photos
- Shows pictures of this plant species.
- Equisetum pratense
- Provides information on this species that is commonly called as Meadow Horsetail.
- Equisetum ramosissimum
- Outlines the classification of this species that is also called the Branched Horsetail.
- Equisetum scirpoides Michx.
- Outlines the classification of this species that is commonly called the Dwarf Scouring Rush.
- Equisetum telmateia ssp. Braunii
- Defines the family, country of origin and description of this species that is also called the Great Horsetail.
- Flora of Southwest Virginia: Phylum Sphenophyta
- Provides information on this spore-bearing group of vascular plants that are also called Equisetophyta.
- Giant Horsetails
- Contains information regarding this species including common names in Brazil, Bolivia and Ecuador. With links and images.
- Horsetail
- Describes the characteristics of this plant division. Includes scientific classification and species.
- Horsetail Family
- Describes this species of plants with jointed stems and distinctive nodes. With image and links.
- Horsetails
- Presents a brief description of this plant group, including descriptions of several Equisetum species.
- ITIS Report: Equisetophyta
- Report covers the taxonomy and nomenclature of member species.
- MavicaNET: Horsetails (Equisetophyta)
- Links to taxonomic and related categories, as well as online resources.
- Phylum Spenophyta: Horsetails or Scouring Rushes
- Details the California elements of this phylum. With images.
- Phylum Sphenophyta (Horsetails)
- Provides a brief description of this plant species. With links to collection of Equisetum images.
- Robert W. Freckmann Herbarium: Equisetophyta
- Presents the characteristics and size and distribution of Phylum Equisetophyta. With images.
- Robert W. Freckmann Herbarium: Keys to the species of Equisetum in the Upper Midwest
- Lists characteristics of this plant species in the area. With links to pictures and description.
- Wonderful World of Equisetum
- Presents detailed species accounts of the horsetails (Equisetum subgenus Equisetum). By Michael Matus.
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