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It's the silica crystals that make horsetail fern (Equisetum hyemale) a scratchy tool.

Specifically, the plant forms silica crystals on the cell walls of its stems and branches. The crystals form in response to the drying of the plant's parts. It is the persistence of these crystals in the branches and stems that make the plant a scouring tool, in many places and throughout many time periods.

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11y ago
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11y ago

Their outer layer of cells contains silica.

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12y ago

the epidermis of the plant

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12y ago

The silica on its exterior.

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Q: What makes the inside of a horsetail scratchy?
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