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These are very interesting but I have to say I'm always a little doubtful about yellow-foliaged irises. In my climate at least, they tend to burn badly and beside their greener relatives they tend to look sickly. Each to his own I suppose but over time I'd be surprised if they are vigorous.
An iris blooming today in our garden. Purchased from Wrightman Alpines as Iris sp. Mongolica it was collected by Joseph Jurasek in the Mongolia Altai at 2300m. -Rob