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Which horsetail species is the tallest living species?
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Equisetopsida
Giant horsetail of Europe (Equisetum telmateia).
The tallest living species of horsetail is the South American species Equisetum giganteum. This slender plant can reach heights of up to 10 metres (approximately 32 feet), though it relies on surrounding vegetation and dense growth for structural support due to its narrow stem diameter of about 2 to 4 centimetres.12