Quercus phellos (willow oak) is a North American species of a deciduous tree in the red oak group of oaks. It is native to the eastern and central United States from Long Island Sound south to northern Florida, and west to southernmost Illinois, Missouri, Oklahoma, and eastern Texas. It is most commonly found growing on lowland floodplains, often along streams, but rarely also in uplands with poor drainage, up to 400 meters (1,300 ft) altitude. Willow oaks can grow moderately fast (height growth up to 60 cm, 2 ft a year), and tend to be conic to oblong when young, rounding out and gaining girth at maturity (i.e. more than 50 years).