Irises: Iris idenification, 0 by Rocco

Rocco wrote:
This plant is growing in my neighboorhood along with blue ones. I have admired it for several years and asked the homeowner about it. The response was "it was here when we bought the house" and have no idea. A friend told me that it was a Japanese or Siberian iris. I checked that out and It didn't seem to resemble either of those. It seems more like a Dutch iris,iris Hollandica. Anyone know for sure? I would like to plant some of them this fall.