We have returned with our ongoing series on the native trees of the Chicago area to highlight sycamore trees throughout Illinois.  Sycamore trees (Platanus sp.), also known as plane trees, are tall deciduous trees found throughout the Northern Hemisphere.  The genus Platanus consists of 11 different tree species; four species referred to as sycamores that are native to North America and seven species referred to as plane trees that are found in...