page_title: Acer traini
section_title: Description
hierarchical_section_title: Acer traini / Description
caption_attribution_description: Acer glabrum subsp. douglasii English: Douglas Maple Français&#160;: Erable nain, Parc national Olympique.
context_page_description: Acer traini is an extinct maple species in the family Sapindaceae described from isolated fossil samaras. The species was described from Miocene-aged fossils found in Canada and the United States of America. It is one of several extinct species placed in the living section Glabra.
context_section_description: The samaras of A. traini have an overall nutlet shape which is triangular with an average length between 0.5–0.9 centimetres (0.20–0.35 in) and ranging between 0.4–0.8 centimetres (0.16–0.31 in) wide and are "moderately inflated" with three distinct ridges. One of the ridges is very distinct, located in the middle of the nutlet and crossing it from the attachment scar to the nutlet tip, the other two are less pronounced. The wing has a length ranging from 1.2–2.5 centimetres (0.47–0.98 in) and a width of 0.6–1.2 centimetres (0.24–0.47 in). The paired samaras have a 30°–40° attachment angle with the wing hosting six distinct veins that start at the nutlet tip and curve from the wing margin, forking three to four times each. Wolfe and Tanai note in the species description that the fossils are the first Tertiary record of an Acer glabrum (Douglas maple)-type fruit in western North America, and further note that no characters separate A. traini fruits from A. glabrum fruits. They suggest that, if fossil leaves are found associated with the fruits which match the living A. glabrum foliage, then A. traini could be considered a synonym of A. glabrum. However, until leaf fossils are found, they suggest the fossils be kept a separate species.
caption: Acer glabrum fruits
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