|Betula papyrifera is probably the tree most people think of as a birch tree. It reaches 50-70' tall, 30-50' spread. The characteristic bark is silvery, peeling in papery sheets, exposing inner reddish orange bark. Mature trees develop an irregular ovalish crown at maturity, and maintain branches low to the groound. The dull, dark green summer foliage turns a nice fall yellow. Flowers are not showy, males brownish, 2-4" long catkins, females greenish, 1" erect catkins. It is best used in cooler climates and is not pollution tolerant, but will do reasonably well in a variety of soil types. Shows resistance to bronze birch borer. Wonderful tree for large park areas, especially with evergreens as a backdrop. Native from Labrador to British Columbia, south to Pennsylvania, Michigan and Montana.