(The complete list of plants is available.)
Virginia waterleaf (Hydrophyllum virginianum) is supposed to be called “waterleaf” because the white-ish spots that sometimes appear on some of its leaves look like watermarks on paper. Yet the lungworts are also covered with white-ish spots and they are named after disease. It makes no sense.

Illinois Carrion Flower (Smilax illinoensis) is noted for not having the prickly stem that makes the Bristly Greenbrier such a horror.

Fragrant Bedstraw (Galium triflorum) stays a little shorter when it has a lot of light, as when I grew it as a garden plant. This was growing in the woods by Ard Godfrey’s dam.

Morrow’s Honeysuckle (Lonicera morrowii), I think. Could be Showy Honeysuckle (Lonicera ×bella). Either way, it is invasive and should be removed.

This is definitely the Showy Honeysuckle (Lonicera ×bella). It performed that most unwanted of plantsy exploits: It escaped cultivation. Now it’s an invasive intruder, and should be eradicated.

I saw a third color of honeysuckle in bloom on May 28th. This was quite dark pink.

I am one of those people with a very strong opinion of buttercups. They should have bright, warm, yellow petals. Five. They should have airy and wiry stems that float the flowers over the surrounding plants, and they should provide bright color intermittently over fields of other wild flowers. You know, buttercup. The Hooked Buttercup (Ranunculus recurvatus) is nearly none of that.

Barberry, which is some flavor of Berberis. It could be Berberis vulgaris, or Common Barberry. It could be the Japanese Barberry (Berberis thunbergii). It doesn’t matter much, because this is either on the “prohibited” list or the “restricted” list of noxious plants. This needs to be dug up and gotten rid of.

I photographed this plant because I was attracted to its unusual leaves. I did not notice the small white flower for weeks after I took the picture. This is Aunt Lucy (Ellisia nyctelea).

Question section:
Is this Wild Comfrey (Cynoglossum virginianum)?
I’m guessing you already know of this resource, but just in case: https://www.minnesotawildflowers.info/page/search
It may be able to turn up candidates for your mystery plant.
Yeah, I do. Thanks for bringing it up. I don’t like to link off-site because of link rot, which is why I am debating linking to them. I already have several pages to hand-edit for bad links. On the other hand, they do seem committed to being a permanent resource.
K.