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Temporal range: Carboniferous
Annularia Stellata.jpg
Annularia stellata
Scientific classification
Kingdom: Plantae
Division: Pteridophyta
Class: Equisetopsida
Order: Equisetales
Family: Calamitaceae

See text

Calamitaceae is an extinct family of plants related to the modern horsetails.[1] Some members of this family attained tree-like stature during the Carboniferous Period (around 360 to 300 million years ago) and in Permian Period, reaching heights of up to 20 meters. The family takes its name from its principal genus Calamites.

Because some proposed species are based on partial fossil records, it is not clear if these are merely different parts of the same type.

Proposed genera and species of Calamitaceae[edit]


  1. ^ Elgorriaga, A.; Escapa, I.H.; Rothwell, G.W.; Tomescu, A.M.F.; Cúneo, N.R. (2018). "Origin of Equisetum: Evolution of horsetails (Equisetales) within the major euphyllophyte clade Sphenopsida". American Journal of Botany. 105 (8): 1–18. doi:10.1002/ajb2.1125. PMID 30025163.

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