Irises: Need help to ID mystery iris, 1 by constance22

constance22 wrote:
Several of these irises mysteriously appeared in a bed that's normally all historic TB Indian Chief.

I've never seen these before--imagine my surprise.

I suppose they've been there all the time, but just haven't ever bloomed till now. (Credit to Cooley's spring iris fertilizer?)

The iris is a lot shorter than other iris, and has bloomed much earlier than the rest of my iris, which are just starting to set buds -- these bloomed at the same time as some dwarf beardeds.

Any thoughts as to identity?