What kind of tree is this?

this tree started growing in my planting pot and i have no idea what it is every leaf has a purple spot on it im in ohio and ive only been here for 3 months and i dont know what this could be can anyone tell me? here are some pictures http://i197.photobucket.com/albums/aa181/santiago200017/SSPX0173.jpg http://i197.photobucket.com/albums/aa181/santiago200017/SSPX0172.jpg http://i197.photobucket.com/albums/aa181/santiago200017/SSPX0171.jpg http://i197.photobucket.com/albums/aa181/santiago200017/SSPX0170-1.jpg