| | Equisetophyta :: Plantae : Gourt |
 | | This class is often placed as the sole member of the Division Equisetophyta (also called Arthrophyta in older works), though some recent molecular analyses place the genus within Pteridophyta, related to Marattiales. |
 | | Other classes and orders of Equisetophyta are known from the fossil record, where they were important members of the world flora during the Carboniferous period. |
 | | The name horsetail arose because it was thought that the stalk resembled a horse's tail; the name Equisetum is from the Latin equus, "horse", and seta, "bristle". |
| science.gourt.com /Biology/Flora-and-Fauna/Plantae/Equisetophyta.html (449 words) |