Norway maple, Acer platanoides, is a commonly planted boulevard and urban tree. It is also invasive. It is likely under-reported in natural spaces because its leaves look similar to sugar maple. As of June 2020 there were only a few dozen reports in MN. Please look for and report naturalized Norway maple.

Naturalized is a non-native plant that does not need human help to reproduce and maintain itself over time in an area where it is not native. When a species is under-reported it's hard to assess if and how that species is causing harm. 

Norway maple was added to the MN Noxious Weed List in 2020, requiring point-of-sale labeling and restricting planting locations.