Acer (/[invalid input: 'icon']ˈeɪsər/) is a genus of trees or shrubs commonly known as<unk> .<unk> s are variously classified in a family of their own, the Aceraceae, or together with the Hippocastanaceae included in the family Sapindaceae. Modern classifications, including the Angiosperm Phylogeny Group system, favour inclusion in Sapindaceae. The type species of the genus is Acer pseudoplatanus (Sycamore<unk> .
There are approximately 128 species, most of which are native to Asia, with a number also appearing in Europe, northern Africa, and North America. Only one species, the poorly studied Acer laurinum, is native to the Southern Hemisphere. Fifty-four species of<unk> s meet the International Union for Conservation of Nature criteria for being under threat of extinction in their native habitat.
The word Acer derives from a Latin word meaning "sharp" (compare "acerbic"), referring to the characteristic points on<unk>  leaves.  It was first applied to the genus by the French botanist Joseph Pitton de Tournefort in 1700. The earliest known fossil<unk>  is Acer alaskense, from the Latest Paleocene of Alaska.
Maple
Nylon
Cypress
Wart
Opium poppy
Hairball
Fly
Chigger