Wood or woodland horsetail, Equisetum sylvaticum. Horsetails are used as biochemical indicators for gold.

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Photo credit: © Henri Koskinen / Alamy / Afripics
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Keywords: biochemical, edible, equisetum, fertile, finland, gold, herb, horsetail, indicator, medicinal, nature, nonflowering, plant, scouring-rush, spore, spore-bearing, spores, spring, stem, sylvaticum, traditional, undisturbed, wild, wood, woodland