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What features distinguish variegated horsetail, Equisetum variegatum?
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Equisetopsida
Giant horsetail of Europe (Equisetum telmateia).
The variegated horsetail (Equisetum variegatum) is distinguished from other members of the Equisetopsida class primarily by its evergreen nature and the presence of distinct black markings on its leaf sheaths.1
Like other species in the genus Equisetum, it shares the characteristic features of the order Equisetales, including a jointed, ribbed stem structure and leaves that are reduced to sheaths encircling the shoots. While many horsetails are known for their abrasive, silica-laden stems, the specific coloration on the sheaths serves as a key identifying feature for this particular species.12