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Annularia
''Annularia'' is a plant fossil belonging to the order Equisetales. ==Description== ''Annularia'' is a form taxon. It is the name given to ''Calamites'' leaves. In fact the stems and the radiating structures of the leaf whorls is similar in the ''Calamites'', an extinct genus of horsetails. These horsetails, belonging to the class of Sphenopsida, were arborescent and grew to a height of 32 feet (10 meters) in a tree-like form. 〔(Illinois State Museum - Annularia sp. Mazon Creek Fossils ) 〕 ''Annularia'' leaves are arranged in whorls of between 8-13 leaves. Its shape is quite variable, being oval in ''Annularia sphenophylloides'' and between linear and lanceolate in ''Annularia radiata'', but they are always flat and of varying lengths. 〔 (MSN ) 〕
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