have had cornflower.. bachelor buttons for decades .. self sowing annual for me ... in the garden.. if you grow the blue long enough .. and have lots of plants .. the genetics will start to regress .. if thats the right term.. and you will end up with a few white.. pink .... and purple ones ... but you would have to have 100s of them to probably start seeing this ... ken

#1 Anemone sp. possibly A. canadensis #2 Can't think right now ( edited to add Ambrosia trifida - Giant ragweed?) # 3 Melilotis albus #4 Trifolium pratense #5 Verbena hastata or similar

That one is very common in southern Arkansas, and is usually growing in shallow water - creek flats, pond and lake margins, etc.

Here it is, but can't get the focus quite right -- clicking on the pic(s) seems to give a slightly better quality pic. That's one stem, and the stuff to the left is another of the same-type plant -- that one is ~6 ft tall: Your suggestion of Teucrium canadense for the second plant looks to be correct. Thanks. Might have to resubmit a pic of the first plant after it flowers...