Acer platanoides
The proportion of introduced species at the site has increased significantly from &lt;1% in 1896 to &gt;5% in 1998. This is partly due to planting of non-native conifers ("Pinus contorta", "Picea abies", "Picea sitchensis" and "Larix decidua") and broadleaves ("Acer platanoides"), but others, such as "Matricaria discoides" and "Veronica persica" (annuals) and "Reynoutria japonica" (a more persistent and highly invasive species) appear to have colonized naturally.