'Myrtle' in the Bible

I saw at night, and behold, a man was riding on a red horse, and he was standing among the myrtle trees which were in the ravine, with red, sorrel and white horses behind him.

And the man who was standing among the myrtle trees answered and said, “These are those whom the Lord has sent to patrol the earth.”

So they answered the angel of the Lord who was standing among the myrtle trees and said, “We have patrolled the earth, and behold, all the earth is peaceful and quiet.”