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Osja (Osi)

Equisetum, horsetail, Equisetum spp., remarkable survivors from the past. The only known living genus of its kind, this group of plants began evolving in the Middle Devonian (±400 M years ago), becoming a dominant species of the undergrowth of Carboniferous forests, and involuntary contributor to much coal, and still exists today with an almost worldwide distribution. One of a meadow flower or grass group. See Pune.