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| Diversity is very low.
There is only one Genus (Equisetum) and 15 species! Based on the focssil record we know that Equisetum was present in the Carboniferous & has changed little over time. Related plants once formed the dominant vegetation over a vast area of the planet. There are many Extinct Species including Trees. Occurrence & Distribution
is World-wide They have a broad range and can be found from the Tropics to the Arctic. |
 Branched Equisetum which resembles a horse-tail!
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