The male sumach-tree834 of Syria is productive, but the female is barren. The leaf resembles that of the elm, though it is a little longer, and has a downy surface. The footstalks of the leaves lie always alternately in opposite directions, and the branches are short and slender. This tree is used in the preparation of white skins.835 The seed, which strongly resembles a lentil in appearance, turns red with the grape; it is known by the name of “ros,” and forms a necessary ingredient in various medicaments.836