I had a look at the Acer in John Salmon's book, "The Trees of New Zealand, Exotic Trees, The Broadleaves" and this is best matching Acer nikoense.
A vine maple, or Acer circinatum of the family Sapindanceae, was spotted in the Olympic National Forest. They can grow from 16-26ft, and this one was standing at about 18ft. The vegetation that clings to its trunk and branches thrives in this moist weather, and it is completely covered in the moss and lichen companions. Although they can be cultivated on open ground, this vine maple was found in the shade of the much larger trees of the forest.
Its leaves are palmately lobed with 7-9 toothy, pointed lobes each, and are arranged oppositely about the branches. This small tree also has samara with wings that line up laterally. In the Spring we would see its small, red flowers with green-yellow petals in the center.
In temperate rain forest associated with old growth large conifers. Palmately lobed leaves 10 cm across and therefore much smaller than the big leaf maple also found in this forest. Leaves are brilliant green with lighter underside, but turning yellow in this fall time. No samara present at this time. Slender branches.
5-lobed leaves, large winged samara that are v-shaped. On the side of the road, in a developed area. Leaves are still mostly green, but some are starting to turn yellow and fall.