Index    Handbook of the Trees of New England by Lorin Low Dame, Henry Brooks

Alnus glutinosa, Medic. European Alder.

This is the common alder of Great Britain and central Europe southward, growing chiefly along water courses, in boggy grounds and upon moist mountain slopes; introduced into the United States and occasionally escaping from cultivation; sometimes thoroughly established locally. In Medford, Mass., there are many of these plants growing about two small ponds and upon the neighboring lowlands, most of them small, but among them are several trees 30-40 feet in height and 8-12 inches in diameter at the ground, distinguishable at a glance from the shrubby native alders by their greater size, more erect habit, and darker trunks.