Acer circinatum (Vine Maple) - Physical characteristics of leaf, flower, fruit, twig, and bark. Provides images. - http://www.cnr.vt.edu/dendro/dendrology/syllabus/acircinatum.htm
Acer circinatum - Includes distribution and occurrence, botanical and ecological characteristics, value and use, and fire ecology. - http://www.fs.fed.us/database/feis/plants/shrub/acecir/