Which genus is the only living member of the class Equisetopsida?

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Horsetail — Equisetopsida Giant horsetail of Europe (*Equisetum telmateia*).

The only living genus within the class Equisetopsida is Equisetum.1

While the class was once a diverse and dominant group of plants that included various extinct orders and tree-like forms, Equisetum—commonly known as horsetails or scouring rushes—is the sole surviving genus today. It consists of approximately 15 extant species of ancient, herbaceous, spore-bearing vascular plants.1