Wim, like you, I have fallen in love with the Irises, especially the smaller species I grow, like the I.cristata, gracilipes, lacustris, innoninata, reticulata, verna, (and many other interesting species I can't think off for now)
Also some juno's and a nice collection of the colourful Pacific Coast irises cultivars.
I might be able to help you with seed of the smaller species I mentioned when they produce seed later on in the season.
I am also familiar with Mark McDonough posting and would love to get hold of those beautiful Iris koreana, odaesanensis, and henryi he mentioned.
Hopefully look forward to acquiring some seed of these charming species in the near future.
Does anyone grow some of those Chinese species, like I.koreana, odaesanensis, and henryi?