Examples from the Web for horsetail
“But in the time of Downton they would have definitely slept on a horsetail mattress,” he said.Savoir Beds’ Royal State Bed: Just Perfect, If You Have $175,000|Daniel Gross|June 27, 2013|DAILY BEAST
He was only human, and you must forgive him if he told of his adventure with the horsetail thieves.
Another common type of Pennsylvanian vegetation was the so-called “horsetail” plant or giant rush.Geology|William J. Miller
I have reason to believe that these two horsetail thieves are taking shelter with some charcoal burners over near the river.