Ah Dee -- it never had a stake. I bought a couple packages of Irises at the end of the 2010 season (I think from Walmart) for a buck apiece. When I got them home, the rhizomes all looked shriveled up and dead -- but I planted them anyway and hoped for a good thing. One was a pink Iris, one was purple. I kept the packages in case any survived, so that I could identify the survivor(s). One rhizome did and bloomed -- and this is it. Of course, now I can't find the dang packages. Coming from Walmart, there's no guarantee what was on the package was IN the package anyway, I have since learned. But the result is the same -- I have no clue.
However -- I've never seen an Iris this color before in my life. That photograph is very accurate and the color is neon/electric -- so I was surprised when you said that there are many this color.
It is a thing of beauty. And if I never find out what it is, I'll love it just the same!!