Thank you, peren.all. I wasn't sure the leaves quite matched R. acris but I know leaves often change with age so you can't always expect that photos will exactly represent what you have. Thank you, jekeesl (south-central Arkansas). I don't think there's any doubt that you are right about plant 2 being a sedge. I promptly went to a wild plant site and searched through a list of--I don't know, maybe 10 million--species of sedge that grow in Michigan and narrowed it down to two that grow in Lenawee County that, to me, look similar: Carex hystericina and Carex frankii. C. typhina wasn't said to grow in this county but it does grow in the county next door and it looks very similar.

Unfortunately we cannot see the detail of the first white flower. Berteroa incana may be a possibility but without a close up of the flower ..... https://extension.umass.edu/landscape/weeds/berteroa-incana

It’s not Geum allepicum which does not have spikes of multiple flowers. Look at the rows of fruits along the stem. Completely unlike the Geum. It’s an Agrimony. The only question is which species. Did you look at Agrimonias? Here is one species which grows in N America https://www.florafinder.org/Species/Agrimonia_gryposepala.php

I use google lens for suggestions sometimes, and it can give me good leads?(sometimes), but other times can be light years off, with absolutely ridiculous results. Does anyone know if Seek is all AI, or do they have people at I naturalist that give the answers for seek? I know a couple people who are credited with thousands of ID'S at I nat . One of them used to be a regular contributor at this forum. I'm thinking Google lens learns from all my internet searches and thus over time gets smarter. I asked someone who was praising a plant app, if they would still remember the plant species, if they ran into it a year later, and were without their app. I don't think much plant knowledge is retained if you rely on an app. I don't understand why a lot of people boast about their apps. You're basically stating that you let a machine do the thinking for you, so nothing about that is something I would be proud of. I respect and admire those who come up with correct ID'S from their own minds and stored knowledge. I totally agree with Ken about apps replacing human discussions, ( teaching, learning), and taking all the fun and enjoyment out of plant Identification.