The Equisetum species (horsetails) of the British Isles

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L. Watson and M. J. Dallwitz


The key and descriptions were generated from a DELTA database (Dallwitz 1980; Dallwitz, Paine, and Zurcher 1993).


Interactive key, including interactive information retrieval • Hints on using the interactive key

The interactive key allows free choice of characters, is easy to use, and can lead to correct identifications in spite of occasional errors. It can display all the illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa.

Character list • Terminology • Implicit attributes

Poems on cryptogams by Giles Watson

References • Citation • Contacts, conditions of use, contributions


The bold parts in the descriptions are diagnostic descriptions, generated with the aid of Intkey (Dallwitz, Paine, and Zurcher 1995). They distinguish most taxa in at least one respect from the other taxa.

• Equisetum arvense L.

• Equisetum fluviatile L.

• Equisetum hyemale L.

• Equisetum × litorale Kühlew. ex Rupr.

• Equisetum × moorei Newm.

• Equisetum palustre L.

• Equisetum pratense Ehrh.

• Equisetum ramosissimum Desf.

• Equisetum sylvaticum L.

• Equisetum telmateia Ehrh.

• Equisetum × trachyodon A. Br.

• Equisetum variegatum Schleich. ex Web. & Mohr

• Extinct Sphenopsida

Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2004 onwards. The Equisetum species (horsetails) of the British Isles. Version: 7th March 2015.’.

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