HORSETAIL (Equisetum), the sole genus of the botanical natural order Equisetaceae, consisting of a group of vascular cryptogamous plants (see Pteridophyta) remarkable for the vegetative structure which resembles in general appearance the genera of flowering plants Casuarina and Ephedra. [Please select]
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Country people who know it, call it Joint Grass or Horsetails; the books call it Equisetum. [Please select]
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