This Sweetgum tree stayed green and turned fairly late this fall. When the tree has its leaves, it is easily recognizable by its five-pointed leaves, which are green in summer and turn yellow or red in autumn. In winter its bare branches form a conical shape.
In autumn, Sweetgum trees produce distinctive spiky seed balls. Right now, the seed balls are still mostly green. Over the next month or so, they will turn brown and fall. After they open, they will look something like the seed balls in this photo.