Aceraceae -- Maple family
    Richard M. Godman, Harry W. Yawney, and Carl H. Tubbs
    Sugar maple (Acer saccharum), sometimes called hard maple  or rock maple, is one of the largest and more important of the  hardwoods. It grows on approximately 12.5 million hectares (31  million acres) or 9 percent of the hardwood land and has a net  volume of about 130 million m3 (26 billion fbm) or 6 percent of  the hardwood sawtimber volume in the United States. The greatest  commercial volumes are presently in Michigan, New York, Maine,  Wisconsin, and Pennsylvania (53). In most regions, both the  sawtimber and growing stock volumes are increasing, with  increased production of saw logs, pulpwood, and more recently,  firewood.