PLANT ID RESOURCES
Invasive.org is a large website with information about thousands of species that may be invasive to different regions of the US. The site hosts lots of great photos, along with resources for mapping and controlling invasive species.
The Wisconsin First Detector Network has a library of fact sheets that contain valuable identification and control information.
The GLEDN app includes pictures of each species that are available offline.
Invasive Plants of the Upper Midwest: An Illustrated Guide to Their Identification and Control by Elizabeth J. Czarapata is a highly recommended book for those interested in invasive plants. It is available for purchase online from various retailers.
Dutchman's breeches is a native spring wildflower.