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On this Wikipedia the language links are at the top of the page across from the article title. The genus is placed in the family Sapindaceae. The closest relative of Acer is Dipteronia, which only has two living species in China, but has a fossil record extending back to the middle Paleocene in North America. The oldest known fossils of Acer are from the late Paleocene of Maple street biscuit company Asia and northern North America, around 60 million years old.
Others are shrubs less than 10 meters tall with a number of small trunks originating at ground level. Maples are distinguished by opposite leaf arrangement. A small number of species differ in having palmate compound, pinnate compound, pinnate veined or unlobed leaves. Maple species, such as Acer rubrum, may be monoecious, dioecious or polygamodioecious.
Maple flowers are green, yellow, orange or red. Though individually small, the effect of an entire tree in flower can be striking in several species. Some maples are an early spring source of pollen and nectar for bees. 3D rendering of a µCT scan of a samara. The distinctive fruits are called samaras, “maple keys”, “helicopters”, “whirlybirds” or “polynoses”. These seeds occur in distinctive pairs each containing one seed enclosed in a “nutlet” attached to a flattened wing of fibrous, papery tissue. They are shaped to spin as they fall and to carry the seeds a considerable distance on the wind.
The genus Acer together with genus Dipteronia are either classified in a family of their own, the Aceraceae, or else classified as members of the family Sapindaceae. Illinois, Massachusetts, New Jersey, New York, and Ohio in the United States and Ontario, Canada. Maples are affected by a number of fungal diseases. Several are susceptible to Verticillium wilt caused by Verticillium species, which can cause significant local mortality. A maple leaf is on the coat of arms of Canada, and is on the Canadian flag. The maple is a common symbol of strength and endurance and has been chosen as the national tree of Canada.
