what trees are native to iowa?
['Boxelder (Acer negundo) Photo by Chrumps, via Wikimedia Commons. ... ', 'Silver Maple (Acer saccharinum) ... ', 'Red Oak (Quercus rubra) ... ', 'Northern Pin Oak (Quercus ellipsoidalis) ... ', 'Downy Hawthorn (Crataegus mollis) ... ', 'Prairie Crabapple (Malus ioensis) ... ', 'Eastern Cottonwood (Populus deltoides) ... ', 'Black Willow (Salix nigra)']