Stay away from the "Marts" !!!!
It does not matter if we are talking Lowes, Wal-Mart, Home Depot, or Kmart or any other "big box" store; they are all the same when it comes to Iris. Not right.
They buy "left overs" and throw it together. The name does not matter to them. And if you don't care then have at it (the potted type are much better than the shrived up crap you find in the Fall. There are plenty of iris vendors out there that will send you the right iris (at their expense) to fix a mix up.
Send an email to schreiners with the issue.