One mystery solved! Whoohoo! Go me!
Hmmm. This fellow, though?
Double checking my receipts from last year, I found one from Brecks that included a "Cool Shades" Dutch Iris Mix! Finally, the sun has come out! The fog has cleared away! I remember now that I hadn't quite decided where to plant these and set them aside. I guess I somehow confused them with the species Iris?