Distribution: Northern Hemisphere deciduous forest.
Uses: As timber, landscape ornamentals
and for maple sugar and syrup.
Features of Interest: The majority
of species are in the genus Acer, with the remaining two species
in the genus Dipteronia and confined to China. Winter sap contains
a high concentration of stored sugars.
Fossil Evidence: Fossil
plant parts are common in the Eocene.
Floral Features : Actinomorphic and perfect or unisexual ( dioecious, monoecious or polygamous). Flowers are small and in inflorescences of corymbs, panicles, racemes, or umbels. Hypogynous or perigynous.
Fruit and Seed Features : Fruit a winged schizocarp or samara. Seed is solitary and without endosperm. Placentation is axile.
: Habit is as shrubs or trees. Leaves simple (rarely palmately
or pinnately compound) and with palmate veins. Opposite and deciduous
or evergreen. Stipules lacking.