Add three images of leaves. See full message for licenses.
This work entitled 'Tulip Tree Leaf' by 'John B.' Dencroica cerulea (user dendroica) at http://www.flickr.com/photos/dendroica/ is available under a Creative Commons Attribution-ShareAlike-2.0
This work entitled 'Chestnut Oak' by 'John B.' Dencroica cerulea (user dendroica) at http://www.flickr.com/photos/dendroica/ is available under a Creative Commons Attribution-ShareAlike-2.0
This work entitled 'Eastern White Oak' by 'John B.' Dencroica cerulea (user dendroica) at http://www.flickr.com/photos/dendroica/ is available under a Creative Commons Attribution-ShareAlike-2.0