* Wisconsin Vascular Plants

[University of Wisconsin Herbarium checklist of vascular plants in Wisconsin; complete with images, distributional maps, habitat, and synonomy]

* University of Michigan Herbarium Online Plants

[University of Michigan Herbarium key to vascular plants in Michigan; BEAUTIFUL images, distributional maps, habitat, and up-to-date names of most species]

* Ferns and Fern Allies of Wisconsin

[UW Green Bay site with keys and glossary to Wisconsin's cryptogams]

* Trees of Wisconsin and Shrubs of Wisconsin

[UW Green Bay site with keys and images to Wisconsin's woody plants]

* Wisconsin Threatened and Endangered Species

[DNR site with listings, information, and images]

* Invasive Plants of Wisconsin

[Invasive Plants Association of Wisconsin website; specific invasive plants of NE WI site also]

* iNaturlist

[iNaturalist website; download the app for smartphone and/or laptop]