I think I made a pretty convincing argument in yesterday’s post, by following this bit of advice from Michigan Flora:

All of these characters are variable, and several must often be considered before identification can be made.

But the best advice is given by the American Iris Society:

It is in the seeds of the two species that an almost infallible means of separation is found.

A-ha. I need to collect seeds, once they’re ready.

Of course, that would be illegal. I might be making some inquiries soon. Maybe I can get permission. You know, for science.

Enough of this. Enjoy the pictures.