The photo shows a few kernels of hard red winter wheat in the top position. On the left and at the bottom are two types of other seed that I sometimes find in wheat. For my curiosity, would someone identify them? The little black things on the right are bugs, showing why I always put my grain purchases in the freezer for a couple of days.
The non-wheat in the photo was found in 2.5 lb of wheat.
Can't help with the seeds, but I have a question about bugs in the bag. Do they get removed somehow before grinding, or sieved out after grinding, or ultimately baked?
I'm guessing that these bugs can be removed from kernels at the mill by sifting or aspiration. In this case, the bugs fell through a large kitchen strainer with 12 wires per inch. However clean grain can also be contaminated during storage or transport. I'm sure plenty of commercial flour has bug parts in it. I don't think I've had bugs in wheat before. Maize, yes.
Weevils, maybe? I once got some growing in a bag of white flour that had been around for a long time. I froze it and sifted them out.
Those small round balls could be vetch seeds. I would always find some in bags of grain and i'd try to pick them out. Quite a task. Easier if you spread the grains out on a flat white surface so you can spot them more easily. They should be removed. They can be eaten but must be properly prepared and some websites are saying if not they can be poisonous. Soaking and baking makes them safe. So I imagine if you miss an odd one here and there but turn the flour into a long fermented sourdough then don't worry. It's not as if you're baking with vetch seed flour. Do your best to remove as much as possible.
As for the other grain it could be barley or oats which are known to be accidently harvested and mixed in with wheat. Spelt also gets mixed in sometimes but they would look like wheat. Rye, Millet and Sorghum are other possibilites but they would look very different to what's in the photo. Barley or Oats would be the best guess.
And the more concerning little bugs could be weevils.