High Quality Content by WIKIPEDIA articles! Calamites is a genus of extinct arborescent (tree- like) horsetails to which the modern horsetails (genus Equisetum) are closely related. Unlike their herbaceous modern cousins, these plants were medium- sized trees, growing to heights of more than 30 meters (100 feet). They were components of the understories of coal swamps of the Carboniferous period.

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