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Lovely Wim. I've tried it twice from Exchange seed and both times it turned out to be pseudacorus.
If anyone, like me, finds Gerhards Iris nertchinska a new one on them, I looked it up in Mathew.Iris nertschinskia, he says, is synonymous with Iris sanguinea in Section Sibiricae, a plant of mountainous meadows, open wet plains and light deciduous woods, ocurring in south Eastern Russia from the east of lake Baikal eastwards to the Ussuri region into Korea and Japan.
Iris sibirica 'Gull's Wing'