Leaves opposite, simple with palmate ventation, sometimes 3-5 palmately compound
Flowers bi- or unisexual [male flower] [female flower], actinomorphic, in a variety of infls.
Plants monoecious, polygamous (bi- or unisexual flowers on same plant) or dioecious
Fruit a 2-winged schizocarp
2 genera, 112 species
Acer - maple, box elder (Acer negundo)
Economic importance: ornamentals, lumber, maple syrup
Diagnostic characteristics: trees, opposite leaves, leaves palmately veined or compound (box elder), fruit a winged schizocarp
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