horsetail

(hôrstāl′)

noun

  1. a horse's tail
  2. any of the only surviving genus (Equisetum) of a division (Equisetophyta) of plants having hollow, jointed stems, with scalelike leaves at the joints and spores borne in terminal cones; scouring rush

See horsetail in American Heritage Dictionary 4

noun
Any of various nonflowering plants of the genus Equisetum, having a jointed hollow stem and narrow, sometimes much reduced leaves. Also called equisetum.

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