A horsetail with a very rough ridged stem, formerly used for scouring and polishing.
- Genus Equisetum, family Equisetaceae, in particular E. hyemale
- Joining these are three scouring rushes (common scouring rush, variegated scouring rush, and water horsetail) and the common, or field, horsetail.
- Dwarf scouring rush is a miniature horsetail only 8 inches tall.
- Equisetum are known as horsetails, foxtails, or scouring rushes - this last name is derived from the fact that Equisetum stores granules of silica within its cells, making it an effective tool for scrubbing pots and polishing wood.
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