Calamitaceae

{{Short description|Extinct family of horsetails}}

{{Automatic taxobox

| fossil_range = {{Geological range/linked|Carboniferous|Permian}}

| image = Annularia Stellata.jpg

| image_caption = Annularia stellata

| taxon = Calamitaceae

| authority = Unger, 1840{{citation needed|date=December 2019}}

| subdivision_ranks = Genera

| subdivision = See text

}}

Calamitaceae is an extinct family of equisetalean plants related to the modern horsetails, known from the Carboniferous and Permian periods.{{cite journal |last1=Elgorriaga |first1=A. |first2=I.H. |last2=Escapa |first3=G.W. |last3=Rothwell |first4=A.M.F. |last4=Tomescu |first5=N.R. |last5=Cúneo |year=2018 |title=Origin of Equisetum: Evolution of horsetails (Equisetales) within the major euphyllophyte clade Sphenopsida |journal=American Journal of Botany |volume=105 |pages=1286–1303 |pmid=30025163 |doi=10.1002/ajb2.1125 |issue=8|doi-access=free }} Some members of this family like Arthropitys attained tree-like stature, with heights over {{Convert|15|m|ft}}, with extensive underground rhizomes. They were largely found in wetland environments.{{Cite journal |last=Rößler |first=Ronny |last2=Feng |first2=Zhuo |last3=Noll |first3=Robert |date=October 2012 |title=The largest calamite and its growth architecture — Arthropitys bistriata from the Early Permian Petrified Forest of Chemnitz |url=https://linkinghub.elsevier.com/retrieve/pii/S0034666712002102 |journal=Review of Palaeobotany and Palynology |language=en |volume=185 |pages=64–78 |doi=10.1016/j.revpalbo.2012.07.018|url-access=subscription }}