The Equisetophyta reference article from the English Wikipedia on 24-Apr-2004
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Equisetophyta

Equisetophyta
Scientific classification
Kingdom:Plantae
Division:Equisetophyta
Classes
Equisetopsida

The Equisetophyta are a very old division in the kingdom Plantae. The plants of this division were among the first plants to grow on land. Of plants still existing, it includes the horsetails. Fossil members of the division included large trees during the Carboniferous period.