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Veterinarian Dan Harmer tells The Salt Lake Tribune the horses at the farm in Wellington ate equisetum, also known as horsetail or scouring rush.

Just know that if you plant the scouring rush or horsetail — Equisetum — it is forever.

Other pieces in the collection included samples from wild plums, chokecherries, hackberries, a primrose and one without flowers, leaves or seeds known to pioneers as scouring rush.

The giant scouring rushes, or horsetails, had the same general characteristics as the little reed-like plants we know by those names to-day.

The ingestion of certain plants as sedges and scouring rushes is also said to cause a bloody condition; madders impart a reddish tinge due to coloring matter absorbed.