Neal - in answer to your question a week ago - I have had that patch of dutch iris for about 4 years. I thinned it out last year so it is sparser than normal. Dutch irises are one of the few bulbs that come back regularly for me - hence they are still in my garden.
Seedfork - love the yellow and purple iris. Hope they multiply for you.
I got the following bulbs from my sister last year. They are blooming now - any one know what it is? Sparaxis? It is about 1.5 ft tall