The Equisetales existed alongside the Sphenophyllales, but diversified as that group disappeared into extinction, gradually dwindling in diversity to today's single genus " Equisetum ".
2.
The Equisetales included the common giant form " Calamites ", with a trunk diameter of 30 to and a height of up to . " Sphenophyllum " was a slender climbing plant with whorls of leaves, which was probably related both to the calamites and the lycopods.
3.
The main Early Carboniferous plants were the Equisetales ( Horse-tails ), late Carboniferous, several other groups, Cycadophyta ( cycads ), the Callistophytales ( another group of " seed ferns " ), and the Voltziales ( related to and sometimes included under the conifers ), appeared.
4.
The Equisetales included the common giant form " Calamites ", with a trunk diameter of 30 to 60 cm and a height of up to 20 meters . " Sphenophyllum " was a slender climbing plant with whorls of leaves, which was probably related both to the calamites and the lycopods.
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