The Equisetum species (horsetails) of the British Isles

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L. Watson and M. J. Dallwitz

Interactive key and information retrieval using Intkey (Windows)

Intkey is easy to use, and has many features that will help you make accurate identifications, including:

If Intkey is already installed on your computer, you can start the key.

Intkey is available at

The complete package (key, descriptions, and illustrations) is available on DVD.