Equisetales
Encyclopedia
The Equisetales is an order of pteridophytes with only one living genus Equisetum (horsetails), of the family Equisetaceae. The fossil record includes additional extinct species in the Equisetaceae and the extinct families Calamitaceae
and Archaeocalamitaceae.
Calamitaceae
Calamitaceae is an extinct family of plants related to the modern horsetails. Some members of this family attained tree-like stature during the Carboniferous Period...
and Archaeocalamitaceae.