The genus Equisetum, to which these horsetails belong, is thought to date back to the Triassic and

alt="The genus Equisetum, to which these horsetails belong, is thought to date back to the Triassic and is generally believed to be the oldest genus of vascular plants still in existence." border="0">

The genus Equisetum, to which these horsetails belong, is thought to date back to the Triassic and is generally believed to be the oldest genus of vascular plants still in existence.

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