The only living genus of the order Equisetales, class Equisetopsida (Sphenopsida), division Equisetophyta (Sphenophyta); distantly related to ferns. It grows in moist places. The hollow, jointed, ridged stems contain SILICATES.
    

concept

Equisetum arvense (Horsetail)

Two plants, one a scouring rush (Equisetum species). Watercolour.

Seven flowering plants, including water milfoil (Myriophyllum species) and starworts (Callitriche species). Chromolithograph by W. Dickes & co., c. 1855.

A horsetail plant (Equisetum species) with an associated beetle and its anatomical segments. Coloured etching, c. 1830.

Handbook of the fern-allies : a synopsis of the genera and species of the natural orders Equisetaceœ, Lycopodiaceœ, Selaginellaceœ, Rhizocarpeœ / by J.G. Baker.

The ferns of Great Britain and their allies, the club-mosses, pepperworts, and horsetails / by Anne Pratt ; published under the direction of the Committee of General Literature and Education, appointed by the Society for Promoting Christian Knowledge.

Equisetum

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Equisetum arvense (Horsetail)

Handbook of the fern-allies : a synopsis of the genera and species of the natural orders Equisetaceœ, Lycopodiaceœ, Selaginellaceœ, Rhizocarpeœ / by J.G. Baker.

A horsetail plant (Equisetum species) with an associated beetle and its anatomical segments. Coloured etching, c. 1830.

Seven flowering plants, including water milfoil (Myriophyllum species) and starworts (Callitriche species). Chromolithograph by W. Dickes & co., c. 1855.

The ferns of Great Britain and their allies, the club-mosses, pepperworts, and horsetails / by Anne Pratt ; published under the direction of the Committee of General Literature and Education, appointed by the Society for Promoting Christian Knowledge.