Most likely a vetch of some sort.

wild, or perhaps feral, columbines. At any rate, there is a large patch of them along the railroad tracks leading into Chelsea. Quite a find.

This is the species coloration, at any rate—well, according to an excellent site about Connecticut wildflowers, Wild Red Columbine, Aquilegia canadensis, is a native member of the buttercup family and prefers rocky woods and slopes, which was certainly the case here, as the railroad tracks were anywhere from 3 to 10 feet above the road.

A scenic shot of them.

sowthistles?

campion?

daisy or common fleabane; they're difficult for me to tell apart.

late wild geranium, Geranium maculatum, I believe. This is a native.

a pretty field of dames’ rocket (not native)

Most likely the European species Common or Tall Buttercup, Ranunculus acris, since I did photograph it in a field...next to the Huron river. Two other candidates are the native Hispid Buttercup (Swamp Buttercup) Ranunculus hispidus (formerly Ranunculus septentrionalis) which favors “moist woods and meadows”, or the European Creeping Buttercup, Ranunculus repens, which prefers “ditches and wet meadows.”

Some sort of forget me not: I'm not competent to tell whether this is a native (as for example small forget-me-nots) but it most likely is the common or true (nonnative) Forget-me-not Myosotis scorpioides (Myosotis palustris) which several sources have noted grows in shady stream-side locations. This flower was indeed growing near a ditch along a tree-shaded roadside near Ann Arbor.

This looks like the buttercup, but is much smaller, and doesn't have the waxy petals. Found in a mown area along the Ann Arbor/Ypsi Huron River bike path...it's quite likely 6mm (1/4”) or less in diameter: my macro focusing was behaving when I took it.

Iris pseudacorus grows well along riverbanks, as this one on the edge of the Huron river demonstrates. Though blue flags are the state wildflower, I recently learned yellow flags are considered a pest.

If so, they're a very pretty one. These were shot on the path near its Ypsi Dixboro entrance.