The plural of equisetum; multiple horsetail plants or instances of equisetum species.
From 'equisetum' + '-s' (English plural). A standard pluralization of the Latin scientific name.
Even though 'equisetums' is the anglicized plural, botanists often use 'equiseta' (the Latin plural) in formal scientific writing—it's a fun example of how science uses both Latin and English rules!
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