The latter reference is magnificent.
Plants woody, trees or shrubs.
Leaves opposite , without stipules , usually simple and palmately veined and lobed, pinnately veined and entire or toothed in a few species, palmately or pinnately compound in even fewer species. Flowers radially symmetric , hypogynous , usually with a well-developed nectary disk , at least some flowers on a plant unisexual, a few species dioecious . Fruit a schizocarpic double samara . Calyx and corolla may consist of 4 or 6 parts, stamens may be 4,5 or about 12. Two genera, Acer and Dipteronia .