The horsetail family. A single genus family (Equisetum) with about 20 species. Like cycads, Equisitum are considered "living fossils" - in their case the lineage goes back to the Paleozoic Era. Among their common names are horsetail, due to their appearance, puzzlegrass, and scouring-rush, this due to the fact that the tough stems make good scouring brushes.
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