PCI article - excel pics
Pacific Horticulture magazine has some great PCI pics with their article and a link to Leonine Iris Nursery in Seattle where there is the biggest collection of PCI pics I've ever seen. Small and low in resolution tho.
PCIs are Pacific Coast Iris. I understand they only flourish west of the Cascades.
Distant Nebula at Leonine Iris site
Here is a link that might be useful: http://www.pacifichorticulture.org/articles/pacific-coast-iris/