Dinopedia
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Calamitea striata is a genus of extinct giant horsetail to which the modern genus Equisetum are closely related. Unlike their herbaceous modern cousins, this plant was a medium-sized tree, growing to heights of more than 30 meters (100 feet), with leaves and branches that resembled more those of conifers. They were components of the understories of coal swamps during the Carboniferous period, around 360 to 300 million years ago.

Calamitea
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