Perhaps good 'ole, invasive Johnsongrass (Sorghum halepense)?

Where growing (state)?

Height?

Image of plants on site.

Another image of an individual plant, dug, and laid on a laid plain background.

Somehow this question popped up in the wrong place where my other picture was entered. Someone did give me the answer though. It was Purple Tridens. It was in my field in mid Missouri about 3 foot high, single not bunched or clumped. Thank you Jean and blakrab for answering.