I have this same siberian iris and I think it's Caesar's Brother. Please check out this web site:

http://davesgarden.com/pf/showimage/44857/

There's a list of pictures of this iris on the left side of the page and this picture is #9.

Hope this helps, Mona

Mona, I think you are right. It is alot smaller bloom than most iris. Moved it last year because where it was it wasnt getting any sun so I did not get any blooms last year. But there is several blooms already on it.
Jill

There are many, many old species type siberians like this being passed around as Caesar's Brother. I have received four different ones in the past 6 years. They go to seed easily and each baby is almost, but not quite, the same. I wouldn't put too must faith in anything being called CB these days. I doubt anyone knows which is the true variety. Regardless, they are pretty and care free which works for me. =)

Mike