'Myrtle trees' in the Bible

"I stared into the night, and there was a man mounted on a red horse! The horse was standing among the myrtle trees in a ravine. Behind him there were red, brown, and white horses."

The man who stood among the myrtle trees answered, "These are the ones whom the LORD sent out to wander throughout the earth."

Then they reported to the angel of the LORD who stood among the myrtle trees, "We have wandered throughout the earth and look! the entire earth is at rest. Everything is quiet and peaceful."