United States, Illinois, Mercer, Keithsburg Township. Off juncction of 450 North and 750 East. Mark Twain National Wildlife Refuge.
3 to 30 inch diameter trees (dbh), to 25 to 70 feet tall. Growing with Acer saccharinum, Betula nigra, Cornus sp., Fraxinus pennsylvanica, Morus alba, Salix sp. Mississippi River bottomland, north of Keithsburg.