Acer pseudoplatanus
- Photographs of leaves, flowers and winged fruits of the Sycamore.
- http://www.plant-identification.co.uk/skye/aceraceae/acer-pseudoplatanus.htm

Acer ginnala - Amur Maple
- Description, photos, and discussion of this tree native to Manchuria, northern China and Japan, and introduced in the midwestern, mid-Atlantic and northeastern United States.
- http://www.lib.uconn.edu/webapps/ipane/browsing.cfm?descriptionid=31

Acer grandidentatum
- Includes distribution and occurrence, botanical and ecological characteristics, value and use, and fire ecology of the Bigtooth Maple.
- http://www.fs.fed.us/database/feis/plants/tree/acegra/

Acer oblongum
- Images of leaves and fruit.
- http://www.dipbot.unict.it/orto/0011-1.html

Acer campestre
- Images of leaves, fruit, and flowers.
- http://www.dipbot.unict.it/orto/0010-1.html