The plural of 'equisetum,' referring to multiple horsetail plants or referring to the genus collectively.
Latin plural form of 'equisetum,' from 'equus' (horse) + 'seta' (bristle). Horsetails were named for their resemblance to a horse's tail.
Horsetails (equiseta) have been on Earth for over 300 million years and were once massive tree-like plants that formed coal deposits—they're living fossils!
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