The bigleaf maple (Acer macrophyllum), also known as the Oregon maple, is a deciduous, long-lived tree native to the Pacific Northwest. True to its name, it dangles unusually large, 5-lobed, palmate (palm-shaped) leaves from its branches. These goliath photosynthesizers measure up to 30 cm (12 in) wide and almost as long, a singular feature that distinguishes the bigleaf maple from others in the soapberry family, Sapindaceae (though some still place it in Aceraceae). Its leaves and branches grow in an opposite formation, and spread into a domed canopy at maturity. The young bark is smooth and grayish-brown, eventually becoming red-brown and deeply fissured with age. Description from Bigleaf Maple (U.S. National Park Service) (nps.gov)
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