Nat. Ord. (Natural Order) Rosaceï¿½. Lin. Syst. (Linnean System) Icosandria, Di-Pentagynia. The European Mountain ash (Pyrus aucuparia) is an elegant tree of the medium size, with an erect stem, smooth bark, and round head. The leaves are pinnated, four or five inches in length, and slightly resemble those of the ash. The snow-white flowers are produced in large flat clusters, in the month of May, which are thickly scattered over the outer surface of the tree, and give it a lively appearance. These are succeeded by numerous bunches of berries, which in autumn turn to a brilliant scarlet, and are then highly ornamental. For the sake of these berries, this tree is a great favorite with birds; and in Germany it is called the Vogel Beerbaum, i. e. bird's berry tree, and is much used by bird catchers to bait their springs with.