I looked up Dutch irises because of your comment. They do look very similar. I was so stoked to see this native pop up because I have been wanting some natives for a while. I didn't even know these were planted amongst the beardeds I've got.
These are the only dutchies ive seen bloom in my neighbors property 
That buttery yellow is something. I really need to transplant those this fall
Thread collapsed
Thread collapsed
Thread collapsed
Now I want to get my hands on some swampland irises! They'll probably go real well with our swamp!
Thread collapsed