Sorry can't ID it for you but you might look at Commanche Acres website they sell alot of Spuria. I ordered some from them last year. I don't recall seeing an all white one. Here are a couple pics of my old one that got me hooked on the spuria, it is about 5 ft tall, yellow and white.

[IMG]http://i289.photobucket.com/albums/ll223/timberohio68/Spuria2.jpg[/IMG]

[IMG]http://i289.photobucket.com/albums/ll223/timberohio68/WhiteYellowBeardlessIris.jpg[/IMG]

Here is a link that might be useful: Commanche Acres

It makes me think of I. orientalis, but that's only a guess. (Pay no attention to the solid yellow iris on that page, it's probably I. monnieri, but I'll look into it.)

You can find other Spuria iris sources here: http://www.spuriairis.com/links.htm

Thanks eroctuse2. I think it is I.orientalis too. My iris has bigger blotch of yellow than I.orientalis. I also check out the Commanche Acres and other Iris seller websites. OMG, so many beautiful Irises. I especially like the maroon and purple color iris spuria. Any one has any luck growing these new I. Spuria introductions? I read that it doesn't bloom the 1st year.