We hanged our harps upon the willows in the midst thereof. The superfluous "harps" were "hung" up upon the trees that grew by the watercourses. These are called "willows," or, according to some, "poplars," but were probably of a different species from any of the trees that grew in Palestine.
The chief Babylonian tree was the palm, which grew in the greatest luxuriance along the courses of all the streams. Tamarisks, poplars, and acacias were also common, but true "willows" hardly appear to have ever been a product of the country.
The 'arabah of our author was probably either a poplar or a tamarisk.