This is Viola novae-angliae, a species of boreal forests in Wisconsin that is also known from Manitoba, Ontario, New Brunswick, Minnesota, Michigan, New York, Vermont, New Hampshire, and Maine. Gary mentioned that it used to be state-listed in Wisconsin; it is common at this site.
Vicia americana is a plant found in a variety of upland habitats in Wisconsin. It is also known from much of North America.
I saw Maianthemum trifolium (=Smilacina trifolia) for the first time ever on this trip. We first saw it in a roadside bog near Wascott, Wisconsin. At our site, it was growing in Sphagnum spp. within the black spruce-tamarack restoration area. It is known from all provinces in Canada, as well as from New England and a handful of northern states in the United States.
Rubus pubescens is an herbaceous, thornless raspberry species of bogs, conifer swamps, boreal forests, lowland forests, sedge meadows, and pine barrens. It is found in nearly every county in Wisconsin, as well as throughout most of Canada and the northern United States.
This is the beautiful sedge Eriophorum angustifolium. This cotton grass is known from the northern half of North America, as well as from a few southwestern states. It grows in a variety of wet habitats.
You may have seen my recent post on this species, Castilleja coccinea. At this site in Superior, Andrew and I found just a single Indian Paintbrush plant. In Wisconsin, this species is found in boreal forests, lowland forests, prairies, and on sand dunes.
We saw numerous sedges on the site, but one of my favorites has to be Carex castanea. Chestnut Sedge, as it is known, is only found in a few northern counties in Wisconsin. It can be found throughout northeastern North America in cedar swamps, mesic conifer-hardwood forests, conifer forests, and mesic meadows.
Corydalis sempervirens is found throughout the eastern United States and Canada, as well as in Alaska and Montana. It is endangered here in Indiana and is rare in the Chicago Region; this was the first time I've ever seen this species. Rock Harlequin is found in sandy soil following a disturbance (fire, scraping, etc.), and it doesn't persist long in the absence of disturbance. In Wisconsin, it is found on cliffs and in savannas. We found it on the site in a burned area.